SOLUTION: A certain trip takes 40 minutes. If half the distance is travelled at an avg speed of 100km/h and the other half at an avg speed of 60km/h, what was the distance travelled during t

Question 849732: A certain trip takes 40 minutes. If half the distance is travelled at an avg speed of 100km/h and the other half at an avg speed of 60km/h, what was the distance travelled during the trip.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = time for the 1st half of the trip
= time for the 2nd half of the trip
(1)
(2)
----------------------------
(1)
(2)
(2)
----------------------
Substitute (1) into (2)
(2)
(2)
(2)
and
(1)
(1)
(1)
The distance traveled is 50 km
check:
(2)
(2)
(2)
OK

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