In a 500 m race, the ratio of two competitors A and B's speeds is 3:4. A begins at a distance of 140 metres. Then A triumphs by:
A. 60 m
B. 40 m
C. 20 m
D. 10 m
Answer:C
In a 500 m race, the ratio of two competitors A and B's speeds is 3:4. A begins at a distance of 140 metres. Then A triumphs by:
A. 60 m B. 40 m C. 20 m D. 10 m
Explanation: A must go a distance of (500 - 140)m, or 360 metres, to reach the winning post.A covers 3 m, whereas B covers 4 m.While A covers 360 metres, B covers 4/3 x 360 metres, or 480 metres.As a result, when A reaches the winning post, B has covered 480 metres and is 20 metres behind.A wins by a distance of 20 metres.