SOLUTION: An ambulance averaged 36 km/h going to an accident and 48 km/h on its return to the hospital. If the total time for the round-trip was 40 mins, including 5 min at the accident sce

Question 157259: An ambulance averaged 36 km/h going to an accident and 48 km/h on its return to the hospital. If the total time for the round-trip was 40 mins, including 5 min at the accident scene, how far from the hospital was the accident?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
d/36+d/48=(40-5)/60
(4d+3d)/144=35/60
7d*60=144*35
420d=5040
d=5040/420
d=12 miles for each trip.
Proof
12/36+12/48=35/60
1/3+1/4=7/12
(4+3)/12=7/12
7/12=7/12

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