Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 31.0mph and half the distance at 70.0mph . On her return trip, she drives half the time at 31.0mph and half the time at 70.0mph .
I get how to do the first part but how do you do it when she drives half the time at 31mph and half the time at 70mph?

Question

Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 31.0mph and half the distance at 70.0mph . On her return trip, she drives half the time at 31.0mph and half the time at 70.0mph .
I get how to do the first part but how do you do it when she drives half the time at 31mph and half the time at 70mph?

anonymous · Answer

lets talk through it. are you there?

anonymous · Answer

D=V/T correct?

anonymous · Answer

You don't know the distance nor do you know the magnitude (direction)

anonymous · Answer

so you assume a straight line forward then the same line back, this is a linear problem

anonymous · Answer

sorry you do know the distance 100 miles.

anonymous · Answer

you should be able to plug and play and use the difference of to get your answer. Is there any way you could put the full problem on the screen?