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531 . A train travelling at a speed of 75 mph enters a tunnel miles long. The train is mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the momen
A. 2.5 min B. 3 min
C. 3.2 min D. 3.5 min

532 . Two stations P and Q are 110 km apart on a straight track. One train starts from P at 7 a.m. and travels towards Q at 20 kmph. Another train starts from Q at 8 a.m. and travels towards P at a speed of
A. 10.30 B. 10
C. 8.45 D. 9.30




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