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.
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.
Share:
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.
New Years Riddles are hand picked New Years Riddles for use by teachers in the classroom and for home school lessons. This new years riddles quiz provides the option to be downloaded as a PDF or printable directly from the New Years Riddles quiz page.
10 Best Riddles For Kids are hand picked 10 Best Riddles For Kids for use by teachers in the classroom and for home school lessons. This 10 best riddles for kids quiz provides the option to be downloaded as a PDF or printable directly from the 10 Best Riddles For Kids quiz page.
