A train running at 48 km/h crosses a man going with the speed of 12 km/h, in the same direction, in 18 second and passes a woman from coming from the opposit direction in 12 seconds . The soeed ( in km/h) of the woman is :
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 6km
Relative speed = 48 - 12 = 36 km/h
Speed = 36 × 5/18 = 10 m/sec
length of the train = 18 × 10 = 180 m
speed = 180/12 = 15 m/sec = 54 km/h
Speed of the woman = 54 - 48 = 6 km