A boat sails m miles upstream at the rate of r miles per hour. If the rate of the stream is s miles per hour, how long will it take the boat to return to its starting point?
A. m/r+2s
B. m/r+s
C. m+r/s
D. m+3r/s
E. None of these
সঠিক উত্তরঃ
A.
m/r+2s
Explanation:
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