<PRE><B>Question 945446</B>
 the same time T required to drive a certain distance varies inversely with the speed R.
 If it takes 2 hours to drive the distance at 40 miles per hour how long will it take to drive the same distance at 45 miles per hour?
:
An inverse relationship ratio equation, find the time (t) to drive the same dist at 45 mph
{{{t/2}}} {{{40/45}}}
cross multiply
45t = 2* 40
45t = 80
t = 80/45
t = 1.778 hrs which is: 1 + .778(60) = 1 hr 47 min
:
:
Confirm this by finding the dist at each speed, should be the same
2 * 40 = 80 mi
1.778 * 45 = 80 mi</PRE>