Question

Two trains started running from the same point at the same time in opposite directions(one towards the North and other towards the South).The speed of the two trains is 22 m/s and 8 m/s respectively. How much time will they take to be 378 km apart?

• A. 3 h 30 min
• B. 3 h 20 min
• C. 4 h 30 min
• D. 2 h 15 min
• E. 3 h 45 min

Answer 1

The correct option is A 3 h 30 min

Trains relative speed$=22+8=30m/s$
$=30\times \frac{18}{5}=108km/h$
$\therefore$ Time taken to be apart by 378 km $=\frac{378}{108}$= 3h 30 min