SchoolEqualsSadLife SchoolEqualsSadLife

02-02-2017
Mathematics

Answered

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?

A16.5 mph
B20 mph
C21 mph
D23 mph

Verified Answer :

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

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