Answer / mkrao

question has some doubt. number of flash will be same. it
will not be change. Both will flash together after 40sec

Answer / aditi

In former case it takes 20seconds for one flash, and in the latter one it takes 40seconds.
So they will flash together at 40th second.

Answer / alpha_enterprises03

1 light 60 sec = 3 time time cycle is 20 sec
2 light 120 sec = 3 time time cycle is 40 sec
in second flash of first light will co inside with first
flash of second light

Answer / bharath.p

The first light flashes at
00:20,00:40,01:00,01:20,01:40,02:00........

The second light flashes at
00:40,01:20,02:00.........
(These all are co-inside with first

*The second light flashes always with first .

*2nd light flashes = 1/2(1st light flashes).

*total no of times both flashes at same time = total no of
time second light flashes

therefore both flashes same at 00:40,01:20,02:00.........
(equal to 2nd light flashes)

Answer / harshgandhi126

AFTER 40 SEC.

Answer / amitsamal

6 minutes

Answer / nitasha sharma

1 min
expln:
first light flashes after 1 min then it will flash after 1
more min(total:2min). second light flashes after 2 min which
is the next one min of first light.

Answer / ajay

1 min

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