Question

Alan takes 3 minutes to draw a picture. Beatrice takes 4 minutes to draw a picture. If Alan and Beatrice start drawing pictures at the same time, how long will they draw before they can complete a picture at the same time?

Answer 1

Answer:

• 1.71 min

Step-by-step explanation:

Alan draws a picture in 3 minute

In one minute he draws:

• 1/3 of the picture

Similarly, Beatrice draws

• 1/4 of the picture in 1 minute

Together the draw in one minute:

• 1/3+1/4 = 7/12 of the picture

To complete the picture they need:

• 1:7/12 = 12/7 min or 1  5/7 min  or 1.71 min