Comments on: OAT Test Prep: Quantitative Reasoning Part 2

By: Leanna

Leanna — Mon, 25 Oct 2010 06:10:42 +0000

Another simpler way, for me anyway, to solve problem 4 is this way:
Chris’s rate = 1 driveway/1 hour
Dale’s rate = 1 driveway/1.25 hours
We can say that their combined rate = 1 driveway/x hours, x being their combined time for which we’re solving.
We can make an equation by combining these 2 rates and setting them equal to their combined rate:
(1 d/1 hr) + (1 d/1.25 hours) = 1 driveway/x hours
Solving for x, we get x = 0.55 hours and converting to minutes x = 33.3 minutes. You can convert the 0.3 to seconds if you wish.

By: Leanna

Leanna — Mon, 25 Oct 2010 05:57:11 +0000

Thank you!

By: monica

monica — Wed, 28 Apr 2010 18:40:43 +0000

this was extremely helpful! thanks!

By: cara

cara — Mon, 22 Mar 2010 23:33:42 +0000

this is a huge help! thanks sooo much

By: Elena

Elena — Tue, 16 Mar 2010 12:57:28 +0000

THANKS