Question:Three persons begin to walk around a circular track. They complete their revolutions in `15 1/6` seconds, ` 16 1/4` seconds and `18 2/3` seconds respectively. After what time will they be together at the starting point again ? 

A `303 1/3` sec 
B `364` sec 
C `3604` sec 
D `3640` sec 

+ Answer
D 

+ Explanation
Required time = L.C. M. of `91/6, 65/4` and` 56/3`

                     `= (L.C.M. of 91, 65, 56,)/(H.C.F. of 6, 4, 3,)`

                     `= (3640)/1`

                    `= 3640` sec.

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Irin Moni

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