A train travelling at 75 miles per hour enters a 3 1/2-mile tunnel. The train is about a quarter mile long. From the time the train enters the tunnel to the time it emerges, how long does it take for the train to pass through
A. 2.5 min
B. 3 min
C. 3.2 min
D. 3.5 min
Answer:B
A train travelling at 75 miles per hour enters a 3 1/2-mile tunnel. The train is about a quarter mile long. From the time the train enters the tunnel to the time it emerges, how long does it take for the train to pass through
A. 2.5 min B. 3 min C. 3.2 min D. 3.5 min
Explanation: The total distance covered is ( 7/2 + 1/4 ) miles, which is 15/4 miles. As a result, Time taken = ( 15/4 x 75 ) hrs = 1/20 hrs = ( 1/20 x 60 ) min. = 3 min.