Book Maths Puzzle

An elevator in a 12-storey building travels the rate of 1 floor every 15 seconds.At the ground floor and the top floor, the lift stops for 50 sec. How many round trips will the elevator make during a 5 (1/2) hour period

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Book Other Question

How many seconds will it take for a train 120 metres long moving at the rate of 15 m/sec to overtake another train 160 m long running from the opposite side at the rate of 90 km/hr? What is the least number which when added to both the terms of the fraction 7/9 will give a ratio equal to 19/23?