Question: 
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?
(m + r)/s
m/(r + s)
m/(r + 2s)
m/(r + 2s)
mr - s
Answer: 
m/(r + 2s)
Last Updated: 
08/11/2021 - 03:31