SOLUTION: over a specified distance speed varies inversely with the time. If a odge viper on a test track goes a certain distance in ne-half minute at 160 mpg, what speed is needed to go the

Algebra ->  Test -> SOLUTION: over a specified distance speed varies inversely with the time. If a odge viper on a test track goes a certain distance in ne-half minute at 160 mpg, what speed is needed to go the      Log On


   

Question 888572: over a specified distance speed varies inversely with the time. If a odge viper on a test track goes a certain distance in ne-half minute at 160 mpg, what speed is needed to go the same distance in three-fourths minute?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
): over a specified distance speed varies inversely with the time.
If a dodge viper on a test track goes a certain distance in one-half minute at 160 mph, what speed is needed to go the same distance in three-fourths minute?
:
Find the distance traveled in 30 sec (in ft)
%28160%2A5280%29%2F3600 * 30 = 7040 ft
:
Let s = speed required to go 7040 ft in 45 sec
45s = 7040
s = 7040/45
s = 156.44 ft/sec
:
In mph: %283600%2A156.44%29%2F5280 = 1062%2F3 mph
:
;
Actually we did not have to got thru all this, use an inverse ratio relationship
s%2F160 = 30%2F45
Cross multiply and see what you get.