Question

Jill is 20 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill walks at 1.5 kilometers per hour. They meet in 5 hours. How fast is Joe walking?
distance = speed*time
both walk for 5 hours
Let x = Joe's speed

1.5*5 + x*5 = 20
7.5 + 5x = 20
5x = 12.5
x = 2.5

check:

Jill walks 1.5*5 = 7.5 km
Joe walks 2.5 * 5 = 12.5 km
total: 20 km

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