Question

One person can run 400 m in 58 s and another can run the same distance in 60 s. If they run together, by what distance does the faster runner beat the slower runner?

Answer 1

$v_1=400/58=6.8966\ (m/s)$

$v_2=400/60=6.6667\ (m/s)$

In 60 seconds they will run

$s_1=6.8966\cdot60=413.79\ (m)$

$s_2=6.6667\cdot60=400\ (m)$ . So,

$\Delta s=413.79-400=13.79\ (m)$ . Answer