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December 17, 2014

December 17, 2014

Posted by **B8** on Sunday, December 1, 2013 at 10:05pm.

1) It took 1.2hours to get halfway there. What is their average speed, in miles per hour, for the first 1.2hours of the trip? 120/2=60 so 60/112=50mph

50mph

2)The average speed for the remainder of the trip was 40mph. How long, in hours,did it take them to drive the remaining distance?120/40= 3hours

#)Traveling home the same route,the kids drove at an average rate of 55 miles per hour. After 2 hours their car broke down. How many miles were they away from home?55x2=110, since the total trip is 120 they were 10 miles away from home.

Are these correct? Thank you for checking my work

- math -
**Jai**, Sunday, December 1, 2013 at 10:13pm1. Yep

2. The remaining distance is is 120 - 60 = 60 miles (because the first 60 miles was already covered in 1.2 hours according to #1)

Speed is distance over time, or

v = d/t

Substituting,

40 = 60/t

t = 60/40

t = 1.5 hours

3. Yep

- math -
**B8**, Sunday, December 1, 2013 at 10:30pmthank you, I see where I went wrong

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