7
Q:
A) 22 sec | B) 32 sec |
C) 42 sec | D) 52 sec |
Answer: B) 32 sec
Explanation:
Explanation:
Given that,
1st train speed = 62 km/hr
2nd train speed = 44 km/hr
Hence the relative speed of two trains is : 62-44 = 18 km/hr = m/s = 5 m/s.
There fore, the first train crosses the second train i.e (85+75)mts of distance with a speed of 5m/s in,
time = = 32 sec.