SOLUTION: A bus travels 87.5 km to another town at a speed of 72.0 km/h. What must be its return rate if the total time for the trip to be 2.50 hours?

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: A bus travels 87.5 km to another town at a speed of 72.0 km/h. What must be its return rate if the total time for the trip to be 2.50 hours?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 791394: A bus travels 87.5 km to another town at a speed of 72.0 km/h. What must be its return rate if the total time for the trip to be 2.50 hours?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
d = rt

d = 72t

87.5 = 72t

87.5/72 = t

t = 87.5/72

t = 1.2152777

So you have spent 1.2152777 hours roughly traveling 87.5 km.

There are 2.5 - 1.2152777 = 1.2847223 hours left and you must travel 87.5 km back to the original starting location

d = rt

87.5 = r*1.2847223

87.5/1.2847223 = r

r = 68.1081039

So the return speed must be roughly 68.1081039 km/hr