A vehicle moves the first third of the way with a speed v1 and the rest of the way with a speed of v2 = 50 km/h. Determine the speed of the first portion of the path if the average speed on the trip was V = 37.5 km/h.

Solution.

D – all the way, D/3 – first third of the way, D*2/3 – the rest of the way

t1 – time of the first third of the way, t2 – time of the rest of the way

Finally, V1=25 km/hr

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