In a 500 m race, the ratio of the speeds of two contestants A and B is 3 : 4. A has a start of 140 m. Then, A wins by:	Choose the correct option.
A) 60 m
B) 40 m
C) 20 m
D) 10 m
E) 30 m
To reach the winning post A will have to cover a distance of (500 - 140)m, i.e., 360 m.   While A covers 3 m, B covers 4 m.   While A covers 360 m, B covers	4/3	x 360	m	= 480 m.   Thus, when A reaches the winning post, B covers 480 m and therefore remains 20 m behind.   A wins by 20 m. ANSWER:20 m
<result>C</result>
In a 500 m race, the ratio of the speeds of two contestants A and B is 3 : 4. A has a start of 140 m. Then, A wins by: