Question

A train takes 55 seconds to pass through a tunnel that is 990 m long. It takes another 35 sec to cross a bridge that is 630m long. What is the speed of the train?
Answer with step by step, please.


Ans: 18m/s

Answer 1

Answer:18m/s

Step-by-step explanation:

990m-630m=360m

55sec-35sec=20sec

speed=distance/time

So, 360/20=18m/s

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Answer 2

Answer:

18m/s

Step-by-step explanation:

Average speed= Total distance travelled/Total time taken

                        = (length of bridge + length of tunnel)/time taken to cross

                        = [990+630]/[55+35]

                       =1620/90

                        =18m/s