Question

An east west river is 2km wide and flows at 4 km/h E. A motorboat has a speed of 10km/h in still water. The motorboat heads due north from the south bank of the river. There is a restaurant directly across the river on the north bank from where the boat starts. How far from the restaurant will the boat be when it reaches the north shore AND how long did it take to get there?

someone help fast with the solution plsss
time for crossing ... 2 km / 10 km/hr = .2 hr

distance from restaurant ... 4 km/hr * .2 hr = .8 km

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