Question

11. Two trains are moving in opposite directions at the speed of 50 and 70 km. per hour. Their lengths are
150 m and 100 m. What is time required for their crossing each other?
(A) 7.5 second
(B) 7.8 second
(C) 8.5 second
(D) 10 second
12. A frain 150 metres long running at a speed of 60 km per hour takes 30 seconds to cross a bridge. What is time required for their crossing each other ?​

Answer 1

Step-by-step explanation:

7.8 second

please mark as best answer and thank me