posted by Anonymous on .
A car goes at 40 miles per hour and returns at the same route at 30 miles per hour. What is the total distance if the time is 1 hour?
17 and 3/7
let the time for first trip be t hrs
then the time for the return trip is 1-t hrs
so 40t = 30(1-t)
40t = 30 - 30t
70t = 30
t = 3/7 hrs
distance = 40t = 40(3/7) = 120/7 miles
or appr 17.14 miles
looks like your answers are correct, make sure you state them in the proper way.