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Downstream: Velocity = 7.5 + 1.5 m/s = 9 m/s
Time for 250 m downstream displacement = 250/9 = 28 seconds
Upstream: Velocity = 7.5-1.5 m/s = 6 m/s
Time for 250 m upstream displacement = 250/6 = 42 seconds
Total time taken = 28 + 42 seconds = 70 seconds
Answer: Time = 70 seconds
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