Trolleybus

Trolleybus line No. 215 measured 30 km. If the trolley bus goes faster by 4 km/h, the way there and back would be shorter by 39 minutes. Calculate the trolley bus speed and the time it takes for a return trip.

Correct answer:

v =  17.3192 km/h
t =  3.4644 h

Step-by-step explanation:




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