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Q.

A train running at 25 km/hr takes 18 seconds to pass a platform. Next, it takes 12 seconds to pass a man walking at 5 km/hr in the opposite direction. Find the sum of the length of the train and that of the platform?


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a

125 m

b

135 m

c

145 m

d

155 m 

answer is A.

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Detailed Solution

Given,
Speed of train= 25 km/hr
Time taken to pass the platform = 18 sec.
Convert speed in m/sec as,
Speed of train= 25× 10003600 m/sec
It is known that,
Distance =speed×time Thus,
Distance =25× 10003600×18 
Distance =25000×183600
Distance =125 m
Thus, option 1 is correct.
 
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