Boat Race!

Algebra Level 2

Alice, Bob, and Carly are flying around the globe in their airplanes. Alice's plane is twice as fast as Bob's and three times as fast as Carly's.

The distance that Bob covers in 36 minutes will take how many minutes for Carly to cover?

48 30 54 24

Andrew Ellinor by Andrew Ellinor , 33, USA

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2 solutions

Gabe Smith
Nov 13, 2015

Since it will take Bob 36 minutes, and Alice travels twice as fast as Bob, it will take Alice 36 2 = 18 \frac{36}{2} =18 minutes.

Since Alice travels 3 times as fast as Carly, it will take Carly 3 ⋅ 18 = 54 3 \cdot 18 = 54 minutes.

3 Helpful 0 Interesting 0 Brilliant 0 Confused
Azadali Jivani
Nov 16, 2015

carly...........bob........alice
(36*3)/2.........36..........36/2
54(ans.)........36............18

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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