Trolleybus line No. 207 measured 20 km. If the trolleybus go faster by 9 km/h, the way there and back would is shorter by 20 minutes. Calculate the trolleybus speed and how much time it takes a return trip.


Trolleybus speed is:  28.7 km/h
The return trip took:  83.7 min


Solution in text The return trip took:=

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