04 - Two runners moving in the same direction in an oval track Problem Runners A and B start together in a race around a 900-ft oval track. Runner A is making a speed of 27 ft/sec and runner B at 22.5 ft/sec. How long will it take runner A to be exactly one circumference ahead of runner B. Solution Click here to expand or collapse this section Runner A is exactly one circumference ahead of runner B when runner A overtakes runner B for the first time: $s_A - s_B = 900$ $27t - 22.5t = 900$ $4.5t = 900$ $t = 200 ~ \text{sec}$ answer Tags Motion Problem motion in a circle Overtaking Time motion in the same direction motion in a closed circuit Log in or register to post comments Book traversal links for 04 - Two runners moving in the same direction in an oval track 03 - In rowing a boat: find the rate of stream Up 05 - Two runners moving in opposite directions in a circular track