Adam drives for 80km at an average speed of 60 km/h and then he drives for 30km at 45 km/h. What was Adam's average speed for the entire trip?

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Answer 1 · 2018-07-11T05:30:25

The average speed is $=55kmh^-1$

Apply the equation

$v=d/t$

The total distance travelled is

$d=80+30=110km$

The total time taken is

$t=80/60+30/45=4/3+2/3=2h$

The average speed is

$barv=d/t=110/2=55kmh^-1$