Question

A lighthouse flashes a beam of light once every 3/5 of a minute. How many times does it flash a beam of light in half an hour?

Answer 1

Total number of flash = 50 flash

Explanation:

Given:

Time taken of a flash = 3/5 minute = 3/5 × 30 = 36 sec

Total time = 30 minute = 30 × 60= 1800 sec

Find:

Total number of flash in 30 minutes

Computation:

⇒ Total number of flash = Total time / Time taken of a flash

⇒ Total number of flash = 1800 / 36

⇒ Total number of flash = 50 flash