Riddle: The fastest time Mary can wash her car is 4min, while the fastest her husband Tom can do it is in 6min. What's the fastest time they can wash it if they did it at the same time?
Answer: Answer= AB/A+B= 4*6/4+6= 24/10= 2min 24sec
It takes Mary 2min 24sec to wash 60% of the car
It takes Tom 2min 24sec to wash 40% of the car
So it takes them 2min 24sec to wash 100% of the car together.
Halloween Riddles are hand picked Halloween Riddles for use by teachers in the classroom and for home school lessons. This halloween riddles quiz provides the option to be downloaded as a PDF or printable directly from the Halloween Riddles quiz page.
Thanksgiving Riddles are hand picked Thanksgiving Riddles for use by teachers in the classroom and for home school lessons. This thanksgiving riddles quiz provides the option to be downloaded as a PDF or printable directly from the Thanksgiving Riddles quiz page.
Christmas Riddles are hand picked Christmas Riddles for use by teachers in the classroom and for home school lessons. This christmas riddles quiz provides the option to be downloaded as a PDF or printable directly from the Christmas Riddles quiz page.
If you would like to use this content on this page for your website or blog, we only ask that you reference content back to us. Use the following code to link this page:
SUBSCRIBE TO RIDDLES
Get our Weekly Riddles Round Up sent direct to your email inbox every week!