ritu can row down stream 20km in 2hours, and upstream 4km in 2 hours. find her speed of rowing in still water and the speed of the current
ritu can row down stream 20km in 2hours, and upstream 4km in 2 hours. find her speed of rowing in still water and the speed of the current
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Answer:
Speed of boat in still water= 6 km/hr
Speed of stream= 4 km/hr
Step-by-step explanation:
Let the speed of boat in still water be x km/hr
Let the speed of stream be y km/hr
Then,
Speed of boat downstream= x+y km/hr
Speed of boat upstream= x-y km/hr
Case 1:
Time taken to go downstream= = 2 hours
Case 2:
Time taken to go upstream= = 2 hours
Now, adding (1) and (2)
Now, substituting the value of x in (1)
So,
Hence,
Speed of boat in still water= 6 km/hr
Speed of stream= 4 km/hr