Solving Statement For Upstream And Downstream
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
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.
A boat covers 24 km upstream and 36 km downstream in 6 hr, while it covers 36 km upstream and 24 km downstream in | |||
| Right Option : C | |||
| View Explanation | |||
The speed of a motorboat is 30 km/h. It starts from Mumbai at 6 am and reaches Goa at 8 am. Same day, it starts from Goa at 12 pm and reaches Mumbai at 4 pm. Find the speed of stream. | |||
| Right Option : C | |||
| View Explanation | |||
The boat which has a speed of 5 km/h in still crosses a river of width 1 km along the shortest possible path in 15 min. The velocity of river water (in km /h), h | |||
| Right Option : A | |||
| View Explanation | |||
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