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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?​

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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