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

What is mathematics

An electrician charges $45 for a house call and then an additional $16 dollars an hour to fix your lights. If the electrician is there for 4 hours, how much wou

In one or two sentences, identify a change (either increase or decrease) in supply or demand that would cause the equilibrium price to increase. QUICKLY ANSWER

Jamal solved this equation: 2+4x=2(2x+1) 2+4x=2(2x+1) 2+4x=2⋅2x+2⋅1 2+4x=4x+2 2+4x−4x=4x−4x+2 2=2 Which statements are true? Select each correct answer. Choice

What is the general relationship between a galaxy's distance from earth and its speed?THIS IS A WRITTEN RESPONSE!!!

Look at the bar graph, which shows voter turnout in 2016 and 2020. Which is the best conclusion someone can draw from this graph? All income groups vote at roug

I am nearly 40. Is it too late to train as a psychologist?

Macbeth is personifying evil. Who do you think will lead the forces of good in a campaign against him?

Points for easy questions what is 12+5

PLEASE ANSWER QUICKLY I WILL GIVE BRAINLYEST 4. Consider the expression 9 + 3 x 2 exponent 2 - 1 x 4 (a) What is the value of the expression? Show your work. (