A river is flowing eastward with the velocity of 5 km/hour.A Boat moved in a still water moved with a speed of 10 km/hour find out the distance covered by the boat on the other side of the bank while moving vertically from one bank to another bank width of river is 10 metre.
Answers
Answer:
Explanation:
Is the boat’s speed measured with respect to the land or the water. They are very different questions and it’s important to specify the frame of reference. The sum of the boats water speed and the river speed will equal the land speed. When adding speeds the direction counts too. In this case, when the direction is the same then the speeds are both positive. Then the direction of the river is opposite that of the boat then it is negative.
The boat is moving with respect to the water at 6km/h. Then
When moving upstream, the speed compared to the land is 6–4=2 km/h land speed.
When moving downstream, the speed with respect to the land will be 6+4=10 km/h.
The boat is moving with respect to the land at 6 km/h both upstream and downstream.
When moving upstream, the boat has to be moving at a water speed of 10km/h so 10–4= 6km/h land speed.
When the boat is moving down stream it does not have to move through the water as fast to maintain a land speed of 6km/h since the river is already moving. So 2+4=6. The boat only needs a speed of 2km/h through the water to have a 6km/h land speed.
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