Book Maths Puzzle Numerical Ability

A manstanding on a platform 220m long notices that a train passes him in 6 sec and passes completely through the station in 21 sec . Find the length of the train and its speed in k/h.

Read Solution (Total 4)

Ans; Length of Train is 88m and velocity of train 44/3(14.67) m/s
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Ans.5km/h
Explanation:
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(220m + xm) / 21 = (x) /6

x=88 m

Length of Train 88 m.........speed in m/s =88/6

In km/hr, 88/6 * 15/8 = 44 km/hr
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length of train=88m nd speed =52.8km/h
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Book Other Question

If k is the ratio of the equation x^2-ax+b=0,then the value of k^2+1/k is Rohan born in 1932 .He had lived one-fourth of his life as a boy ,one-third of his life as a youth ,one-fifth of his life as a man and the remaining 13 years as an old man . In which year did Rohan die?