A is 7/2 times as fast as B. If A gives B a start of 80 m, how long should the race course be so that both of them reach at the same time?  Choose the correct choice from the following
A) 140 metre B) 180 metre C) 190 metre D) 240 metre E) 12 metre
Speed of 140 metre : Speed of B = 7⁄3 : 1 = 7 : 3   It means, in a race of 7 m, 140 metre gains  (7-3)= 
<gadget id="calculator"> (7-3)</gadget>
<output>4</output>
4 metre   If 140 metre needs to gain 80 metre, race should be of 7/4×80= 140 metre   140 metrenswer is 140 metre
<result>A</result>
A is 7/2 times as fast as B. If A gives B a start of 80 m, how long should the race course be so that both of them reach at the same time?