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Popular Word Problems >

Jill leaves a store traveling 7mph. After 8 hours John leaves the store traveling the same direction at 21 mph. How long until John catches up with and passes Jill?

Solution

J i ll l e a v es a s t ore t r a v e l in g 7 m p h . A f t er 8 h o u rs J o hn l e a v es t h e s t ore t r a v e l in g t h e s am e d i rec t i o n a t 21 m p h . Ho w l o n g u n t i l J o hn c a t c h es u p w i t h an d p a sses J i ll ?

Solution

Joh n^{'} s time : 4

Solution steps

Translate the problem into an equation:

7 (x + 8) = 21 x

Solve for

x, 7 (x + 8) = 21 x : x = 4

Joh n^{'} s time : 4

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