SOLUTION: the time, t, required to drive a certain distance varies inversely with speed, r. If it takes 12 hours to drive the distance at 60 miles per hour, how long will it take to drive th

Question 965811: the time, t, required to drive a certain distance varies inversely with speed, r. If it takes 12 hours to drive the distance at 60 miles per hour, how long will it take to drive the same distance at 85 miles per hour?
about 7.08 hours
about 5.00 hours
about 1.42 hours
about 8.47 hours
Found 2 solutions by checkley77, macston:
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
D=RT
D=60*12
D=720
720=85T
T=720/85
T=8.47 HOURS.
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
.
d=a certain distance
d=rt Since distance at each speed is the same:
rate(60mph) x time@60mph = rate(95mph) x time@85mph
.
where t=time at 85 mph
Divide each side by 85 mph.

ANSWER: It would take 8.47 hours to dive the same distance at 85 mph that it takes 12 hours to drive at 60 mph

RELATED QUESTIONS
Question: The time t required to drive a certain distance varies inversely with the speed (answered by richard1234)
The time, t, required to drive a certain distance varies inversely with the speed r. If... (answered by ewatrrr)
the same time T required to drive a certain distance varies inversely with the speed R.... (answered by ankor@dixie-net.com)
The time t required to drive a certain distance varies inversely with the speed r. If it... (answered by addingup,Edwin McCravy)
The time t required to drive a fixed distance varies inversely as the speed r. It takes 5 (answered by jojo14344)
Driving time. The time t required to drive a fixed distance varies inversely as the speed (answered by Alan3354)
The time t required to drive a fixed distance varies inversely as the speed r. It takes 5 (answered by nyc_function)
The time t required to drive a fixed distance varies inversely as the speed r. It takes 5 (answered by stanbon)