A motorboat has two throttle positions on its engines.the high speed position propels the boat at 30km/hr in still water and the low speed position gives one third the higher speed. the boat moves from its dock downstream on a river with throttle at low speed position . the return trip took 5% longer time that it did for the downstream trip.Determine the velocity of the flow of the river.
Rahul Jiji George , 10 Years ago
Grade 10
1 Answers
Sumit Majumdar
Last Activity: 10 Years ago
Dear student, The low speed velocity would be given by
Let the speed of the river be vr. Hence the net downward speed would be:and the net upstream speed will be equal to. Let the downstream/upstream distance be equal to d. Hence, the time taken while going downstream would be equal to:and the time taken while going upstream would be equal to: Hence, Therefore,