Question
Thu February 12, 2009 By:

speed

Expert Reply
Thu February 12, 2009

let the speed is x.   so we have  total distance = total time * speed

total distance is 24 km

during upstream speed is 11 + x  so time = 12 / 11+x

during downstrem speed is 11 - x  so time is = 12 / 11 - x

we have 12 / 11+x  +  12 / 11 - x  =  2hours45minutes = 11 / 4

solving we get x = 5 km/hr

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