Question 25
A swimmer dives into a completely calm 25 m long swimming pool. The ripple from the dive travels across the surface of the pool at 2.5 m/s, reflects off the far end and travels back down the pool to meet the swimmer. After diving in at the end, the swimmer swims at a steady speed that would take him 20 seconds to swim the length of the pool. The swimmer and the returning ripple meet when the swimmer has travelled approximately:
