written test Interview Numerical Ability Time Distance and Speed

The two trains of lengths 400 m, 600 m respectively, running at same directions. The faster train can cross the slower train in 180 sec, the speed of the slower train is 48 km. then find the speed of the faster train?

A. 58 Kmph B. 68 Kmph
C. 78 Kmph D. 55 Kmph

Read Solution (Total 1)

B. 68 Kmph

Let the speed of the faster train be x kmph, then their relative speed= x-48 kmph
To cross slower train by faster train, distance need to be cover=(400+600)m = 1 km. and time required = 180 sec = 180/3600 hr = 1/20 hr.
Time=Distance/Speed => 1/20 = 1/(x-48) or x=68
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