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Thomas and Ashley are swimming in a river which is 15 m wide. Both swim with...

Thomas and Ashley are swimming in a river which is 15 m wide. Both swim with a speed u = 1.2 m/s relative to the water, which is flowing downstream at a speed v = 0.25 m/s. They both leave a point on one bank at the same time. Thomas swims directly upstream a distance 15 m, then turns back and swims downstream to his starting point. Ashley points herself so that, taking account of the current, she can swim to a point directly across the river and then turns around and swims directly back to their starting point. How much time does each take to make their 30 m round trips?
Note: do the problem non-relativistically

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