Wednesday
May 22, 2013

# Homework Help: physics

Posted by Nicole on Friday, October 9, 2009 at 2:23am.

A person takes a trip, driving with a constant speed of 98.5 km/h except for a 21.0 min rest stop. If the person's average speed is 63.3 km/h, how much time is spent on the trip and how far does the person travel?

How much time in hours and how far in km

• physics - bobpursley, Friday, October 9, 2009 at 9:48am

distance is not known.

but we know this:
avgspeed*(timedriving+21min)=constantspeed*time

Now I intentionally avoided the difficult part: Change the speed to m/s (from km/hr) and change the time 21min to seconds. You can do other units, but they must be consistent.

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