Posted by John on Thursday, November 15, 2012 at 2:03pm.
add up the times
time = distance/speed
If his downhill speed is s,
8/s + 8/(s-3) = 4
s = 6
check:
8 miles @ 3mph = 8/3 hr
8 miles @ 6mph = 4/3 hr
total: 4 hr
Related Questions
Math - A goal for elite runners is to complete a mile in 4 minutes. At what ...
Algebra 1 - A history teacher rented a bus for a class trip to the museum. The ...
Math - I skakeboard 5 blocks west abd 8 miles north to get to my friend's ...
algebra - a two part canoe trip,the first part of the trip the canoist traveled...
math - substitute to find the value of the expression. A train must cover a ...
Math - john's columm covered the first 12 miles in 4 hours. he then ...
math - A marathon runner ran 26.2 miles in 2 h 30 min. Find these rates: a. ...
math - a heavy freight train made a trip of 360 miles, running part of the ...
math - On the first day of their 2598 mile trip , the curtis family drove 683 ...
math - On the first day of their 2598 mile trip , the curtis family drove 683 ...
For Further Reading
