A runs $\frac{4}{3}$ times as fast as B. How much of a start should A give B in a 400 m race so that the race ends in a dead heat?

Explanation

1. 01

   A dead heat means both finish together. While A runs 400 m, B runs $\frac{3}{4} \times 400 = 300$ m.

2. 02

   So B should start $400 - 300 = 100$ m ahead.