To begin with, let us ignore car A. Car B and car C travel in opposite directions. Their relative speed = Sum of the two speeds = 45 + 54 kmph. = 99kmph. = 99 * m/s = m/s = 27.5m/s.
The relative distance = 220m. So, time they will take to cross each other = = 8 seconds.
Now, car A has to overtake car B within 8 seconds. The relative distance = 50m
=> Relative speed should be at least m/s = 6.25m/s
=> 6.25 * kmph = 22.5kmph
Car B travels at 45kmph, so car A should travel at at least 45 + 22.5 = 67.5kmph.
Correct Answer: 67.5 km/hr
All features of the online course, including the classes, discussion board, quizes and more, on a mobile platform.
Download videos onto your mobile so you can learn on the fly, even when the network gets choppy!