Asked by anonymous

You are driving on a Canadian freeway to a town that is 200 kilometers from your home. After 30 minutes you pass a freeway exit that you know is 50 kilometers from your home. Assuming that you continue at the same constant speed, how long will it take for the entire trip?

I did:
50km/30min = 120km/h
200*30/ 50 =h
120 =h

but I got 120 mins wrong.

Answers

Answered by oobleck
first, 50km/30min = 100km/hr
so, 200 km takes 2 hr
that's 120 min, but maybe they wanted the time in hours.

you are kind of sloppy with the units in your calculations, switching back and forth between minutes and hours.
Answered by anonymous
thanks oobleck
Answered by henry2,
50km/0.5h = 100 km/h.

T = (200-50)/100 = 1.5 h.
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