Two trains are travelling at 60 km/hr and 90 km/hr in opposite directions. Their respective lengths are 1.10 kilometres and 0.9 km. The slower train takes the following time in seconds to cross the quicker train:
A. 36
B. 45
C. 48
D. 49
Answer:C
Two trains are travelling at 60 km/hr and 90 km/hr in opposite directions. Their respective lengths are 1.10 kilometres and 0.9 km. The slower train takes the following time in seconds to cross the quicker train:
A. 36 B. 45 C. 48 D. 49
Explanation: 60+ 90) km/hr = 150 x 5/18 m/sec = 125/3 m/sec, Relative speed = (60+ 90) km/hr (1.10 + 0.9) km = 2 km = 2000 m is the distance covered.Time required = 2000 x 3/125 sec = 48 sec