Question

sita takes 35 seconds to pack and label a box, for ram the same job takes 42 seconds and for geeta, it takes 28 seconds. if they all start using the machine at the same time, after how many seconds will they be using the labeling machine together?

Answer 1

after420 seconds they use labeling together

Answer 2

Answer:

420 mins or 7 hrs

Step-by-step explanation:

taking the LCM of each

35=5*7

42=3*2*7

28=2*2*7

LCM=5*2*2*3*7

          =420