A runs at 8 m/s and B at 6 m/s. How many seconds of start should A give B in a 240 m race for a dead heat?

Explanation

1. 01

   A takes $\frac{240}{8} = 30$ seconds and B takes $\frac{240}{6} = 40$ seconds.

2. 02

   B must start 10 seconds earlier.