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A river has width 0.5 km and flows from west to east with a speed 30 km per hour if a boat man starts sailing his boat at a speed 40 km per hour normal to bank the boat shall cross the river in time

A river has width 0.5 km and flows from west to east with a speed 30 km per hour if a boat man starts sailing his boat at a speed 40 km per hour normal to bank the boat shall cross the river in time 

Grade:10

1 Answers

Shubham Kumar
54 Points
5 years ago
the time taken will be s/v and here s(distance)=0.5 km and v(velocity)=40 km/h ,therefore the time taken will be 45 seconds .the flow is in a direction perpendicular to the direction of movement therefore there will not be any other force actinf in the way of crossing and it can be caalculated as usual.

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