Question

Three coolers a, b, c take 15 mins, 20 mins and 25 mins to cool the water bottle. If all the three coolers are turned on simultaneously at 9 am and bottles are send continuously one after another without time gap then at what time will all the three coolers take in the bottle simultaneously for the first time.

Answer 1

at 300 three coolers a, b, CTO cool the the water bottle simultaneously for the first time