Question
If the speed of a boat in a still water is 20 km per
hour and the speed of current is 5 km per hour then the time taken by the boat to travel 100 KM with the current isSolution
. Let the speed of boat in still water =B and speed of stream =S B=20km/h, S= 5km/h Speed of boat in downstream =(B+S) =25km/h Time = Distance /Speed =100/25 =4hours
If radius of earth is R then the height ‘h’ at which the value of ‘g’ becomes one-fourth is-
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