Thomas Travel
Not so easy as it looks…?
Thomas traveled from City A to City B at an average speed of 80km/h. On his way back from City B to City A, he traveled at 120km/h. What was the average speed throughout the trip?
*NO, the answer is NOT 100km/h – like I said, it is not as easy as it looks.
d = distance between cities (km)
t(1) = duration of first trip (h)
t(2) = duration of second trip (h)
t(1) = d / 80
t(2) = d / 120
Average speed = Total distance / Total time = (2d) / (d / 80 + d / 120) = 2d / (d / 48) = 96 km/h
Thomas Cook seeks financial help
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