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  1. km/hr to m/s conversion:

a km/hr =


a x

5


m/s.

18

  1. m/s to km/hr conversion:

a m/s =


a x

18


km/hr.

5

  1. Formulas for finding Speed, Time and Distance
  2. Time taken by a train of length l metres to pass a pole or standing man or a signal post is equal to the time taken by the train to cover l metres.
  3. Time taken by a train of length l metres to pass a stationery object of length b metres is the time taken by the train to cover (l + b) metres.
  4. Suppose two trains or two objects bodies are moving in the same direction at u m/s and v m/s, where u > v, then their relative speed is = (u - v) m/s.
  5. Suppose two trains or two objects bodies are moving in opposite directions at u m/s and v m/s, then their relative speed is = (u + v) m/s.
  6. If two trains of length a metres and b metres are moving in opposite directions at u m/s and v m/s, then:

The time taken by the trains to cross each other =

(a + b)

sec.

(u + v)

  1. If two trains of length a metres and b metres are moving in the same direction at u m/s and v m/s, then:

The time taken by the faster train to cross the slower train =

(a + b)

sec.

(u - v)

  1. If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take a and b sec in reaching B and A respectively, then:

(A's speed) : (B's speed) = (b : a)


A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?

A.

3.6

B.

7.2

C.

8.4

D.

10

Answer: Option B

An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 1 hours, it must travel at a speed of:

A.

300 kmph

B.

360 kmph

C.

600 kmph

D.

720 kmph

Answer: Option D


If a person walks at 14 km/hr instead of 10 km/hr, he would have walked 20 km more. The actual distance travelled by him is:

A.

50 km

B.

56 km

C.

70 km

D.

80 km

Answer: Option A


A train can travel 50% faster than a car. Both start from point A at the same time and reach point B 75 kms away from A at the same time. On the way, however, the train lost about 12.5 minutes while stopping at the stations. The speed of the car is:

A.

100 kmph

B.

110 kmph

C.

120 kmph

D.

130 kmph

Answer: Option C

Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?

A.

9

B.

10

C.

12

D.

20

Answer: Option B



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