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.. A river flows with a speed of 4 km/hr and a boat sails at the speed of 12 km/hr in stillwater. If the boat takes 2 hours to cover some distance, moving downstream then howmuch time it will require to cover the same distance moving upstream? |
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Answer» Answer: time taken to travel upstream : time taken to travel downstream = 2 : 1 speed upstream : speed downstream = 1 : 2 (as speed is INVERSELY proportional to time when distance is constant) Let speed upstream= x and speed downstream = 2x Rate of the stream = (2x-x)/2 =x/2 x/2 is GIVEN as 1 km/hr => x = 2km/hr Step-by-step explanation: |
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