Question

1.A tour boat on a river traveled 40 miles downstream in 4 hours. The return trip against the current took 5 hours. What was the rate of the current?

A. 2.0 MPH
B. 1.5 MPH
C. 0.5 MPH
D. 1.0 MPH

This is also another question I did not understand. Thank you.

Answer 1

(p + r)(4) = 40
(p -r) (5) = 40
p + r = 10
p -r = 8
2p = 18
p = 9
9 + r = 10
r = 1
= 1 MPH