Q. Train A is moving at a speed of 75 km/hr and crosses a man who is running at 12 km/hr in the same direction in 12 seconds. If Train A crosses Train B which is running at the speed of 45 km/hr in the same direction in 48 seconds, then find the length of train B?
A.170 meter
B.190 meter
C.150 meter
D.160 meter
E. None of these
Sol:
Let the length of Train A =X(in meter)
(75-12)*5/18=X/12
63 * 5/18 * 12=X
X=210
Let, the length of Train B =Y
(75-45)*5/18=(210+Y)/48
30 * 5/18 * 48=(210+Y)
210+Y=400
Y=190 meter