SchoolEqualsSadLife SchoolEqualsSadLife

02-02-2017
Mathematics

contestada

To get to work, you drive for 20 minutes at 30 mph, and walk 10 more minutes at 3 mph. What was your average speed?

a) 16.5 mph
b) 20 mph
c) 21 mph
d) 23 mph

Respuesta :

mdarrow01 mdarrow01

15-02-2017

Note D = r(t)
20min = 1/3 hr and 10min = 1/6 hr

(1/3hr)30mph + (1/6hr)3mph = 10.5 mi, the total distance traveled.

total distance / total time = average speed = 10.5/(1/3 + 1/6) = 10.5/(2/6 + 1/6)
10.5mi/.5hr = 21mph

Hope This Helps

Answer Link

Otras preguntas

Cindy's backyard is shaped like a rectangle that measures 20 feet long and 25 feet wide. How many square feet of sod does Cindy need to cover her entire backyar

Without oxygen, a cell can extract a net gain of only ___________________ molecules of ATP from each glucose molecule.

Paul n’a pas beaucoup de cheveux sur la tete

The lowest fractions for 40 over 25?

Roses uses nylon string as a border around a square picture. The string is 60 inches long.

The roots of the function f(x) = x2 - 2x

calculate the surface area of the figure below.

how many times can 2500 go into 25

Read the excerpt from "Object Lesson Part 1." This information supports the prediction that "Hardly. They didn't know you were coming." They had betrayed her, t

What type of figure is shown? The base of the figure is a The figure is a