Speed, Time and Distance
 An athlete runs 200 metres race in 24 seconds. His speed (in km/hr) is :

 20
 24
 28.5
 30

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Speed = Distance Time = 200 m/s 24 200 m/s = 10 × 18 = 30 km/hr. 24 24 5 ∵ x m/s = 18 x km/hr 5 Correct Option: D
Speed = Distance Time = 200 m/s 24 200 m/s = 10 × 18 = 30 km/hr. 24 24 5 ∵ x m/s = 18 x km/hr 5
 A man crosses a road 250 metres wide in 75 seconds. His speed in km/hr is :

 10
 12
 12.5
 15

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Speed = Distance = 250 75 3 = 10 m/sec = 10 × 18 km/hr. 3 3 5 ∵ 1 m/s = 18 km/hr 5
= 2 × 6 km/hr. = 12 km/hr.Correct Option: B
Speed = Distance = 250 75 3 = 10 m/sec = 10 × 18 km/hr. 3 3 5 ∵ 1 m/s = 18 km/hr 5
= 2 × 6 km/hr. = 12 km/hr.
 A man walking at the rate of 5 km/hr. crosses a bridge in 15 minutes. The length of the bridge (in metres) is :

 600
 750
 1000
 1250

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Speed of the man = 5km/hr
= 5 × 1000 m / min = 250 m / min 60 3
Time taken to cross the bridge
= 15 minutes
Length of the bridge
= speed × time= 250 × 15m = 1250m 3 Correct Option: D
Speed of the man = 5km/hr
= 5 × 1000 m / min = 250 m / min 60 3
Time taken to cross the bridge
= 15 minutes
Length of the bridge
= speed × time= 250 × 15m = 1250m 3
 An aeroplane covers a certain distance at a speed of 240 km hour in 5 hours. To cover the
travel at a speed of :same distance in 1 2 hours, it must 3

 300 km./hr.
 360 km./hr.
 600 km./hr.
 720 km./hr.

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Let the required speed is x km/hr
Then, 240 × 5 = 5 × x 3
∴ x = 720 km/hr.Correct Option: D
Let the required speed is x km/hr
Then, 240 × 5 = 5 × x 3
∴ x = 720 km/hr.
 A train is travelling at the rate of 45km/hr. How many seconds it
will take to cover a distance of 4 km ? 5

 36 sec.
 64 sec.
 90 sec.
 120 sec.

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Time taken = Distance time = (4/5) hour 45 = 4 × 60 × 60 sec. 5 × 45
= 64 secondsCorrect Option: B
Time taken = Distance time = (4/5) hour 45 = 4 × 60 × 60 sec. 5 × 45
= 64 seconds