Wednesday

January 28, 2015

January 28, 2015

Posted by **Anonymous** on Monday, March 25, 2013 at 7:58pm.

- math -
**Reiny**, Monday, March 25, 2013 at 8:54pmtime to go up hill = d/10

time to go down = d/30

total time = d/10 + d/30 = 4d/30

avg speed = total distance / total time

= 2d/(4d/30)

= 2d(30/4d)

= 60/4 = 15 mph

**Answer this Question**

**Related Questions**

maths - A motorist travels 120 miles to his destionation at an average speed of ...

math - andys average driving speed for a 4-hour trip was 45 miles per hour. ...

Math - 6. Columbus' ships covered approximately 144 miles a day. How many miles ...

Math - Runner runs 8 miles at 5 miles per hour, then another 2 miles at 7 miles ...

math - A woman drove to work at an average speed of 40 miles per hour and ...

math - This is an SAT prep question. A woman drove to work at an average speed ...

math - A traveler travels on a highway 80 miles at 55 miles per hour, he then ...

Algebra - You commute 56 miles one way to work. The trip to work takes 10 ...

Pre-calc - a driver averaged 50 miles per hour on the round trip between akron, ...

Pre-Calc - a driver averaged 50 miles per hour on the round trip between akron, ...