A train travels the distance between stations P and Q at a speed of 126 km/h, while in the opposite direction it comes back at 90 km/h. Another train travels the same distance at the average speed of the first train. The time taken by the second train to travel 525 km is:
Answer & explanation
Correct answer: option 1
Average Speed = \(\frac{2 × S1 ×S2 }{S1 + S2}\)
= \(\frac{2 × 126 ×90 }{126 + 90}\)
= 105 km/h
Time = \(\frac{Distance }{Speed}\)
= \(\frac{525 }{105}\)
= 5 hours