A boat can move downstream at a speed of 16 km/h and upstream at a speed of 9 km/h. What is the speed of the stream and the speed of the boat in still water?
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0
Answer:
speed of downstream = 16 km/hr. So speed of upstream = 9km/hr. Total time taken for downstream journey = 15 min (given). Now total time taken for upstream journey = 8/8 = 1 hr = 60 min.
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9
Answer:
speed of stream= (downstream-upstream)/2
speed of boat in still water= (downstream+upstream)/2
hence, speed of stream= (16-9)/2= 3.5km/hr
speed of boat in still water= (16+9)/2= 12.5 km/hr
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