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River is 4.0mile.wide following at rate 2miles /hrs time taken by boat to cross river with speed of 4miles/hrs

Shreeank , 7 Years ago
Grade 9
anser 1 Answers
Arun

Last Activity: 7 Years ago

Dear student
 
For minimum time the velocity in direction of motion shoud be maximum. And since speed of river is perpendicular hence have no influence on time taken to cross it. Now for maximum speed boat should move perpendicular to flow of river hence tme = distance ÷ speed = 4÷4=1hr    RegardsArun (askIITians forum expert)

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