Question

Q9) Two lighthouses flash their lights every 30 seconds and 40 seconds respectively. Given that they flashed together at 6

Answer 1

Step-by-step explanation:

we take the lcm of 30 and 40 and the answer is 120 seconds(2 minutes)..

If the lightouses flash at 6 the again it flashes at 6:02

Answer 2

Answer:

Let the First Lighthouse= A

second Lighthouse= B

A flashes light every 30 and B flashes every 40 second.

Taking LCM of both = 120(3×2×5×2×2)

for obtaining 120 second(2 min)

(A = 120/30 = 4

B = 120/40 =3)

if it flashed at 6:00

then it will flash after 120 sec(2 mins)

so it they wi flash together at 6:02

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