Philip P. answered • 04/08/16

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Let's say that when moving to the east, your moving in the positive direction. When moving west, you're moving in the negative direction.

Relative distance = 3 mi - 5 mi + 13 mi =

**11 miles**east of where the car startedIn computing total distance, you don't care which direction you travel:

Total distance = |3 mi | + |- 5 mi| + |13 mi | =

**21 mi**.The car gets 40 miles per gallon and it has 4 gallons left, so it can drive 40*4=160 miles. Since 21 mi < 160 mi, there's more than enough fuel for the trip.

Risha S.

why is there 4 gallons left in the tank?12/22/19