Speed, Time and Distance ( 21 to 25 )

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Speed Time and Distance ( 21 to 25 ):


APTITUDE QUESTIONS (SPEED TIME AND DISTANCE):

21. Two trains starting at the same time from two stations 200 km apart and going in opposite directions cross each other at a distance of 110 km from one of the stations. What is the ratio of their speeds?

A)    9:20

B)    11:9

C)    11:20

D)    10:3

E)    None of these

View Answer

Answer: option (B)

Explanation:

In the same time, they cover 110 km and 90 km respectively.
∴ Ratio of their speed = 110 : 90 = 11 : 9

 

22. Bombay Express left Delhi for Bombay at 14:30 hrs, travelling at a speed of 60 kmph and Rajdhani Express left Delhi for Bombay on the same day at 16:30 hrs, travelling at a speed of 80 kmph. How far away from Delhi will the two trains meet?

A)    120 km

B)    360 km

C)    480 km

D)    500 km

E)    None of these

View Answer

Answer: option (C)

Explanation:

Suppose they meet x hours after 14:30 hrs.
Then, 60x = 80(x – 2) or x = 8
∴ distance = (60 * 8) km = 480 km.

 

23. Sound is said to travel in air at about 1100 feet per second. A man hears the axe striking the tree, 11/5 seconds after he sees it strike the tree. How far is the man from the wood chopper?


A)    2197 ft

B)    2420 ft

C)    2500 ft

D)    2629 ft

E)    None of these

View Answer

Answer: option (B)

Explanation:

Distance = (11/5*1100) feet = 2420 feet

 

24. A certain distance is covered by a cyclist at a certain speed. If a jogger covers half the distance in double the time, the ratio of the speed of the jogger to that of the cyclist is:

A)    1:2

B)    2:1

C)    1:4

D)    4:1

E)    None of these

View Answer

Answer: option (C)

Explanation:

Let the distance covered by the cyclist be x and the time taken be y.
Then, ratio = ((1/2)x)/2y : x/y = 1/4 : 1 = 1 : 4

 

25. 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

E)    None of these

View Answer

Answer: option (B)

Explanation:

Speed = (600/(5 * 60)) m/sec = 2 m/sec = (2*18/5 ) km/hr = 7.2 km/hr

 

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