A Man is running in a tunnel at a speed of 20m/s and he takes 10 minutes to cross the tunnel. When he is halfway through the tunnel, a car enters the tunnel in the direction he is running. Both of them reached the end of the tunnel together. What is the speed of the car?

A Man is running in a tunnel at a speed of 20m/s and he takes 10 minut

1.	A Man is running in a tunnel at a speed of 20m/s and he takes 10 minutes to cross the tunnel. When he is halfway through the tunnel, a car enters the tunnel in the direction he is running. Both of them reached the end of the tunnel together. What is the speed of the car?
A.	25 m/s
B.	30 m/s
C.	40 m/s
D.	80 m/s
E.	Data insufficient
Answer» D. 80 m/s

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A Man is running in a tunnel at a speed of 20m/s and he takes 10 minutes to cross the tunnel. When he is halfway through the tunnel, a car enters the tunnel in the direction he is running. Both of them reached the end of the tunnel together. What is the speed of the car?

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