Two trains A and B each have proper length L and move in the same direction. A person C is on the ground, and observes that train A is behind train B. Observer C also measures the speeds of trains A and B to be 4/5c and 3/5c, respectively. Calculate the time it takes for train A to overtake train B as measured by a passengeron train B. By this we mean the time between the front of train A passing the back of train B, and the back of train A passing the front of train B.

Two trains A and B each have proper length L and move in the same direction. A person C is on the ground, and observes that train A is behind train B. Observer C also measures the speeds of trains A and B to be 4/5c and 3/5c, respectively. Calculate the time it takes for train A to overtake train B as measured by a passengeron train B. By this we mean the time between the front of train A passing the back of train B, and the back of train A passing the front of train B.

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