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  • CDS Exam ELEMENTARY MATHEMATICS Study Material

Digitization help student to explore and study their academic courses online, as this gives them flexibility and scheduling their learning at their convenience. Kidsfront has prepared unique course material of ELEMENTARY MATHEMATICS Time And Speed for CDS Exam student. This free online ELEMENTARY MATHEMATICS study material for CDS Exam will help students in learning and doing practice on Time And Speed topic of CDS Exam ELEMENTARY MATHEMATICS. The study material on Time And Speed, help CDS Exam ELEMENTARY MATHEMATICS students to learn every aspect of Time And Speed and prepare themselves for exams by doing online test exercise for Time And Speed, as their study progresses in class. Kidsfront provide unique pattern of learning ELEMENTARY MATHEMATICS with free online comprehensive study material and loads of CDS Exam ELEMENTARY MATHEMATICS Time And Speed exercise prepared by the highly professionals team. Students can understand Time And Speed concept easily and consolidate their learning by doing practice test on Time And Speed regularly till they excel in ELEMENTARY MATHEMATICS Time And Speed.


Time And Speed
A train 150 m long passes a pole in 10 s . It will pass a standing train which is 220 m long in ?

a) 23s
b) 28s
c) 24.6 s
d) 26s


✔Answer
✔Solution
Correct Answer Is : 24.6 s
Solution Is : Speed of train = Length of train/Time taken to cross the tree = 150 / 10 = 15 m/s Time to cross the train = (Length of moving train + length of standing train) / Speed of moving train = 220 + 150 / 15 = 370 /15 = 24.6 s =
A bus can complete a journey in 10h , if it travels at 50 km/h . At what speed (km/h) the bus must travel in order to complete the journey in 8 h ?

a) 60
b) 62.5
c) 70
d) 80


✔Answer
✔Solution
Correct Answer Is : 62.5
Solution Is : Speed of bus = 50 km/h Time taken = 10 h Distance covered = speed x Time taken = 50 x 10 = 500 km now speed of bus to cover same distance in 8 h Speed of bus = Distance travelled / Timetaken = 500 / 8 = 62.5 km/h
A train running at 36 km/h crosses a pole in 25 s . Length of the train is

a) 250 m
b) 300 m
c) 225 m
d) 275 m


✔Answer
✔Solution
Correct Answer Is : 250 m
Solution Is : Speed of train in m/s = 36 x 5/18 = 10 m/s
Time taken to cross the pole = 25 s
Now, length of train = Speed of train x
time taken to cross pole = 10 x 25 = 250 m
A train 150 m long passes a tree in 12 s . It will pass a tunnel of 250 m long in

a) 20s
b) 25s
c) 32s
d) 26s


✔Answer
✔Solution
Correct Answer Is : 32s
Solution Is : Speed of train = Length of train/Time
taken to cross the tree = 120 / 12 = 12.5 m/s
Time to cross a tunnel = (Length of tunnel + length of train) / Speed of train
= 250 + 150 / 12.5 = 32 s
A bus can complete a journey in 6h , if it travels at 60 km/h . At what speed (km/h) the bus must travel in order to complete the journey in 9 h ?

a) 60
b) 40
c) 30
d) 35


✔Answer
✔Solution
Correct Answer Is : 40
Solution Is :
Speed of bus = 60 km/h
Time taken = 6 h
Distance covered = speed x Time taken
= 60 x 6 = 360 km
now speed of bus to cover same distance in 9 h
Speed of bus = Distance travelled / Timetaken
= 360 / 9 = 40 km/h
The speed of a bus is 72km/h. the distance covered by the bus in 5s is

a) 50m
b) 74.5m
c) 100m
d) 60m


✔Answer
✔Solution
Correct Answer Is : 100m
Solution Is : Speed of bus in m/s = 72 x 5/18 = 20 m/s
Distance travelled in 5 s = 20 x 5 ( speed x time ) = 100 m
Two men start together to walk a certain distance, one at 4km/h and another at 3km/h. The former arrives half an hour before the latter. find the distance.

a) 6km
b) 9km
c) 8km
d) 7km


✔Answer
✔Solution
Correct Answer Is : 6km
Solution Is : Let distance be x km
By given condition ,
x/3 - x/4 = 1/2
4x-3x / 12 = 1/2
x = 12 / 2
x = 6 km

Thespeed of a train going from Nagpur to Allahabad is 100 km/h. While its speed is 150 km/h, when coming back from Allahabad to Nagpur. Then, the average speed during the whole journey is

a) 135 km/h
b) 120 km/h
c) 125 km/h
d) 140 Km/h


✔Answer
✔Solution
Correct Answer Is : 120 km/h
Solution Is :
A car covers a certain distance going at a speed of 60 km/h and returns to the starting point at a speed of 40 km/h. The average speed for the whole journey is

a) 48 km/h
b) 50 km/h
c) 45 km/h
d) 40 km/h


✔Answer
✔Solution
Correct Answer Is : 48 km/h
Solution Is :
A train is moving at a speed of 80 km/ h and covers a certain distance in 4-5 h. the speed of the train to cover the same distance in 4 h is

a) 70km/h
b) 85km/h
c) 90 km/h
d) 100 km/h


✔Answer
✔Solution
Correct Answer Is : 90 km/h
Solution Is : Distance covered by the train in 4.5 hr
=80*45 km=360 km
Now ,to cover this distance is 4 h,the speed of the train
= 360/4 =90 km/h
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