Friday

April 18, 2014

April 18, 2014

Posted by **Indigo** on Wednesday, November 24, 2010 at 10:02pm.

I tried this question, and apparently the answer isn't 45 mph. It's something of a trick question. Any help/hints would be much appreciated!

- Algebra II -
**Reiny**, Wednesday, November 24, 2010 at 10:56pmAverage speed = total distance / total time

time for first trip = d/40

time for return trip = d/50

total time = d/40 + d/50 = 9d/200

total distance = 2d

avg speed = 2d/(9d/200) = 400/9 = 44.444.. mph

- Algebra II -
**Indigo**, Saturday, November 27, 2010 at 10:54amThank you!

**Related Questions**

algebra - 1. The time t that it takes for a salesman to drive a certain distance...

algebra - 1. The time t that it takes for a salesman to drive a certain distance...

math - You jog at 6.6 mi/h for 5.0 mi, then you jump into a car and drive for ...

MATH - THE AVERAGE WIND SPEED INCREASED 19 MILES/H FROM 8 AM TO 12 NOON. THE ...

Physics - Could someone please review my answers and tell me if I am on the ...

physics - You jog at 6.2 mi/h for 5.0 mi, then you jump into a car and drive ...

Math - Paul drove from his house to work at an average speed of 40 miles per ...

Maths - A boy cycled from his home to a friend's house 24km away at an average ...

physics - You jog at 6.0 mi/h for 5.0 mi, then you jump into a car and drive for...

physics - You jog at 6.0 mi/h for 5.0 mi, then you jump into a car and drive for...