a man can row upstream at 7kmph and downstream at 10 kmph. find mans rate in still water & current of rate.
Answers
The man's rate in still water is 8.5 km/hr and the rate of the current is 1.5 km/hr.
Step-by-step explanation:
It is given that,
The speed of the man rowing upstream = 7 km/hr
The speed of the man rowing downstream = 10 km/hr.
Now, we have the following formula,
If the downstream speed is x km/hr and the upstream speed is y km/hr
Then,
- The Speed in still water = ½ * [x + y] km/hr
- The rate of the current = ½ * [x - y] km/hr
Thus, by substituting the given values in both the formulas above, we get ,
The speed in still water = ½ * (10 + 7) = ½ * (17) = 8.5 km/hr.
And
The rate of current = ½ * (10 - 7) = ½ * 3 = 1.5 km/hr
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