SSC Government Jobs Exams Numerical Ability Time Distance and Speed

Four runners started running simultaneously from a point on a circular track. They look 200 sec, 300 sec, 360 sec and 450 sec to complete one round. After how much time do they meet at the starting point for the first time?

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ANS:1800, because LCM of 200,300,360,450 is 1800.
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SSC Other Question

A student was asked to divide a number by 6 and 12 the quotient. He, however, first added 12 to the number and then divided it by 6, getting 112 as the answer. The correct answer should have been "x" number of men can finish a piece of work in 30 days. If there were 6 men more, the work could be finished in 10 days less. The original number of men is