Question

at an international airport planes take off from five different runways 3,4,8,12 and 15 minutes interval . at 7:30 am planes took off from all the five runways simutaneously.when will they next take off together again

Answer 1

We have to find the Lcm of given numbers.

3= 3
4= 2×2
8= 2×2×2
12= 2×2×3
15=3×5

Lcm= 2×2×2×3×5= 120minutes

After 120 minutes = 2hrs

The 5 planes will next take off together at = 7.30a.m + 2hrs= 9.30a.m

Answer 2

Answer:

9:30am

Explanation

3 = 3*1

4 = 2*2

8 = 2*2*2

12 = 2*2*3

15 = 3*5

LCM = 2*2*2*3*5 = 120

120 minutes = 2 hours {1 hour = 60 minutes}

7:30 + 2 hours = 9:30am

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