The Jones family took a 31.5-mile canoe ride down the Indian River [with the current] in 7 hours. The next day, the return trip back up the river [against the current] took 9 hours. Find the rate of the canoe in still water and the rate of the current.

answer: 177/8

step-by-step explanation:

yes, gavin is right.

step-by-step explanation:

gavin is correct. 

this problem is about converting 9% per year to how many percent per quarter. the rate is still the same. it only differed in the time period. so, through dimensional analysis,

9% per year  × (1 year / 4 quarters) = 2.25% per quarter

if he was asked to convert 9% per year to how many percent per quarter  compounded quarterly, then you will not simply divide by four. this is because compounding is not linear.

hope this , have a good day. c;