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8th Foundation NTSE

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Maths / Polynomials / Solving Statement For Upstream And Downstream
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Solving Statement For Upstream And Downstream

Solving Statements For Upstream and Downstream: In these type of situations, while calculating upstream speed we subtract the speed of river from the speed of boat because the river is pushing the boat downwards even when the boat is moving upwards. Whereas when the boat is moving downstream the speed is calculated by adding the speed of river to the speed of boat.

Example: A boat goes downstream from one point to another in 9 hours. It covers the same distance upstream in 10 hours. If the speed of the stream is 1 km/hr. Calculate the speed of boat in still water.

Solution:     Let the speed of boat in still water be x km/hr

                    Speed of stream  = 1 km/hr

                    Speed upstream = x-1 km/hr

                    Speed Downstream = x + 1 km/hr

                    large speed= frac{distance}{time}

large distance= speed; X ;time

Distance upstream = (x-1) X 10 = 10x - 10 Km

Distance Downstream = (x+1) X 9 = 9x + 9 Km

According to the question the distance is the same

                          10x-10 = 9x + 9

                          10x - 9x = 9+ 10

                                    x = 19 km/hr

So the speed of boat in still watre = 19 km/hr.


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