14
Q:
A) 68 kmph | B) 52 kmph |
C) 76 kmph | D) 50 kmph |
Answer: A) 68 kmph
Explanation:
Explanation:
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)
X = 68 kmph