Two trains are moving in opposite direction of 60 km/hr and 90 km/hr . Their lengths are 1.10 km and 0.9 km respectively . The time taken by the slower train to cross the faster train in seconds is :

Options

A. 58 sec
B. 50 sec
C. 48 sec
D. 56 sec

Answer

C

Explanation

Relative speed = Total lengths/time
`[60 + 90] = (1.10 + 0.9)/("time")`
time = 2 /150 = 1/75 h
1 hour = 3600 sec
1/75 hr = ?
`? = (3600)/(75) = 48` sec