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

the force of attraction between any two objects

I need help solving number 10 and 14

can you please help me :) please I need it today

Que pena! Sara an eight - year old girl, is talking to her science teacher at school. Read the conversation and fill in the blank with the appropriate indicativ

Im trying to get the area of this picture. But how do i find the answer and ?

Which equation shows a proportional relationship between x and y? A. y=-3x-2B. y=9C. y=3x+1D. y=4x

WRITING Explain how to solve the system of linear equations 2x - 3y = -4 Equation 1 -5x + 9y = 7 Equation 2 by elimination

Which activity would be best for a 30-year-old who has a target heart rate of 140 bpm? (1 point) aPrepare dinner bStatic stretches cBrisk 20-minute walk dRun on

______ angels are individuals who have already started and successfully operated their own businesses.

Explain how a raccoon is helping the environment when it eats the fruit of a plant.