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?
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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) (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
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