Two trains of lenths 120 m and 90 m are running with speed of 80 km/h…

Question

Two trains of lenths 120 m and 90 m are running with speed of 80 km/hr and 55 km/hr respectively towards each other on parallel lines. If they are 90 m apart, after how many seconds they will cross each other?

Accepted Answer

Option C. 8 sec. Answer & Solution Answer: Option C Solution: & Relative speed & = (80 + 55)km/hr & = 135 km/hr & = ( 135 × 518 )m/ & = ( 752 )m/ & Distance covered & = (120 + 90 + 90)m & = 300m & Required time & = ( 300 × 275 ) & = 8