In 400m race A gives B a start of 7 sec & beats him by 24m.in another race A beats by 10 sec. the speeds are a)8,7 b)7,6 c) 12,10 d) 10,8

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C. Sivasankaran

  • May 22nd, 2006
 

a is the time taken by A to cross the 400m

For condition 1,  a+7 is the time taken by the B to cross  376m (i.e 400m-24m).  Hence speed of B is 376 / (a+7).

For conditon 2, a+10 is the time taken by the B to cross 400m. Hence speed of B is 400 / (a+10).

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