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

Female Genital mutilation is also known as .....(female protection, female Circumcision, female Guidance Arts)

who destroyed Jerusalem and scattered the Jews throughout the world?

QUESTION 1She usually(go) to work buy bus, but today she(go) bycar.

Which expression is equivalent to 4(n + 5)?

write a letter to the editor of a newspaper daily times of India regarding the harmful effect of long terms use computer and other gadget during live class.

What type of mixture scatters light and cannot be filtered easily?

It is strongly recommended to use the word "died" instead of "gone to sleep" to children of age 6-9 to reduce confusion about the permanence of deathTrueFalse

Mention and explain four characteristics of effective teaching

Please help! Correct answer only, please! Given matrix A and B both have dimensions 2 x 2 and are the inverse of one another what should be the following produc

which event marks the beginning of the rising action in the most dangerous game?