Question

There are 3 taps. Water starts to drip from the three taps. A drop of water comes out of first, second and third tap every 2 seconds, 4 seconds and 7 seconds respectively. After how many seconds will the drops of water from all the three taps fall together?

• A. 28 seconds
• B. 14 seconds
• C. 42 seconds
• D. 56 seconds

Answer 1

The correct option is A

28 seconds

In order to find after how many seconds drops of water from all the three taps fall together, we need to find the L.C.M.

The LCM will be the product of 2 × 2 × 7 = 28

So, after 28 seconds, the drops of water from all the three taps will fall together.