Question

A man walks half of his trip by 40km/hr and ride a bicycle the rest of his trip by 60km/hr. What is his average speed

Answers

Steve
total distance: 2d
total time: d/40 + d/60
avg speed: 2d/(d/40 + d/60) = 48 km/hr

Man, that guy is some fast walker and biker!

Note that this is really just one of those mixture problems in disguise.

2/s = 1/60 + 1/40
s = 48
Greg
It is spelled physic
Steve
actually, it's physics

a physic is a medicine or drug

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