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Popular Word Problems >

Mr. Bliss traveled 150 miles at a certain média rate. By increasing his rate 15 mph, he traveled 225 miles in the same time he spent on the 150 mile trip. Find his média rate on the trip.

Solução

M r . Bl i ss t r a v e l e d 150 mi l es a t a cer t ain a v er a g e r a t e . B y in cre a s in g hi s r a t e 15 m p h, h e t r a v e l e d 225 mi l es in t h e s am e t im e h e s p e n t o n t h e 150 mi l e t r i p . F in d hi s a v er a g e r a t e o n t h e t r i p .

Solução

trip 2 speed : 22.5

Passos da solução

Given Speed:

trip 1 : 15

Given Distance:

trip 1 : 150

trip 2 : 225

Represent the time in terms of

x :

trip 1 : t_{2}

trip 1 Speed 15 Time t_{2} Distance 150

Write an equation for trip 1Distance = Speed

\cdot

Time

150 = 15 x

Resolver para

x, 150 = 15 \cdot x : x = 10

time : 10

Represent the speed in terms of

y :

trip 2 : y

trip 2 Speed y Time 10 Distance 225

Write an equation for trip 2Distance = Speed

\cdot

Time

225 = y \cdot 10

Resolver para

y, 225 = y \cdot 10 : y = \frac{45}{2}

\frac{45}{2} = 22.5

trip 2 speed : 22.5

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