Two trains start running towards each other from two places 396 km apart. The ratio of speeds of trains is 7 : 11 and the speed of first train is 77 km/h. After how many minutes will both the trains meet each other?
Answer & explanation
Correct answer: option 2
1st : 2nd
Speed = 7 : 11
ATQ,
7R = 77 ⇒ 1R = 11
⇒ Relative speed = (7 + 11)R = 18R = 18 × 11 = 198 km/hr
Time = \(\frac{396}{198}\) = 2 h = 120 mins.