Question

Please answer please
On a morning walk three persons step off together and their steps measure 40cm, 42cm, 45cm, what is the minimum distance each should walk so that each can cover the same distance in complete steps?
(here you are going to use LCM why)

Answer 1

We have to find the LCM of 40 cm, 42 cm and 45 cm to get the required minimum distance. Because we are asked the minimum distance Now, 40 = 2 × 2 × 2 × 5, 42 = 2 × 3 × 7 45 = 3 × 3 × 5 ∴ LCM (40, 42, 45) = 2 × 3 × 5 × 2 × 2 × 3 × 7 = 30 × 12 × 7 = 210 × 12 = 2520 


Minimum distance each should walk 2520 cm. so that, each can cover the same distance in complete steps.

HOPE IT HELPS....

Answer 2

Because it says minimum steps you need to find and LCM will say you the minimum distance at where there all 3 legs will meet together