Question

A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from the opposite direction in 6 seconds. The speed of the second train is

• A. 48 km/hr
• B. 54 km/hr
• C. 66 km/hr
• D. 82 km/hr

Answer 1

Answer: (D)

82 km/hr

Answer 2

The correct option is (D):Lengths of both trains =$108 + 112 = 220m$
Speed of train1 = 50 km/hr
Speed of train2 = $x$km/hr
Relative speeds of both trains (in m/s) =$(50+x)\times\frac{5}{18}$
Using speed$(50+x)\times\frac{5}{18}=\frac{220}{6}$
$50 + x = 132$
$x = 132 − 50 = 82$
$\therefore$ Speed of second train = 82 km/hr