A 640 metre long train travelling at 80 km/h overtook a 540 metre long train travelling at 72 km/h in the same direction. How long did it take the faster train to cross the other train completely?
Answer & explanation
Correct answer: option 4
Relative spped , when moves in same direction = 80 - 72 = 8 km/h
8 km/h = 8 × \(\frac{5 }{18 }\)m/sec = \(\frac{20 }{9}\) m/sec
Total distance = 640 + 540 = 1180 m
Time taken = \(\frac{1180 × 9 }{20 }\)
= 531 sec
= 8 minutes 51 seconds