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

A registered nurse is teaching a nursing student about lawrence kohlberg's theory of moral development. which information provided by the registered nurse regar

Skills that the child can accomplish with assistance but can't yet perform independently are part of

Read the passage from "Racing the Storm.” "Yeesh!” Anastasia exclaimed. Finally giving her attention to the scene outside, she smiled. "Wow. It’s beautiful, isn

you have merged onto a limited access highway. limited acces highways can have posted speed limits as high asa. 75 mphb. 70 mphc. 65 mph

The rate of a chemical reaction in a cell is the measure of how

North americans seem to be much more likely to have ________ than people from middle eastern countries.

what do you need to start a new business

**PLEASE HELP ASAP** Betsy is analyzing a quadratic function f(x) and a linear function g(x). Will they intersect? Yes, at positive x-coordinates Yes, at nega

George Frederic Handel was born in Germany but became a citizen of A. Belgium. B. Ireland. C. Italy. D. Engl

A patient is taking nicotinic acid (niacin) to treat hyperlipidemia. the patient reports a flushing sensation along with gastrointestinal irritation. the nurse