Question

Uniform Motion Related Problem
Port A is 25 km downriver from port B. At noon a tugboat leaves port B and travels upstream at 15 kph. At 3 p.m. a hyrodrofoil leaves Port A travelling upstream at 50 kph. At what time will the hydrofoil pass the tugboat?
by 3:00, the tug has traveled upstream 3*15 = 45 km, so it is now 20 km upstream from B.

The boats' relative speed is 35 km/hr, so how long does it take the foil to make up the 20 km head start of the tug?

Add that time to 3:00.

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