vi

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Phổ biến Word Problems >

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

Lời Giải

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 .

Lời Giải

trip 2 speed : 22.5

Các bước giải pháp

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

Giải

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

Giải

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

\frac{45}{2} = 22.5

trip 2 speed : 22.5

Ví dụ phổ biến

The radius of a circle is 1 in. Find the chu vi The diameter of a circle is 6ft Find its chu vi in terms of The radius of a circle is 16.7 cm. Find the chu vi to the nearest tenth.21 is 75% of what number The product of a number and 7 less than the number is 858 . Find the numbers. Assume both numbers are positive. The numbers are and