In 10 sec the heart beats 12 beats.

So, in 60 sec it will beat (12*6) 72 beats.

60 sec means one minute; so the heart beat rate is 72 beats/minute.

Filter 1 (F1) takes 40 minutes to fill a tank of 20 liters.

Filter 2 (F2) takes 30 minutes to fill the same tank.

Working together they will take (F1 x F2F1+ F2) 40 x 3040+30 = 1207 minutes to fill the tank of 20 liters.

We need to calculate the time taken by both the filters to fill the tank of 70 liters.

For this, recall the relation: T1 x W2 = T2 x W1

T1 = 1207 minutes; T2 = ?; W1 = 20 liters; W2 = 70 liters

1207 x 70 = T2 x 20

T2 = 60 minutes or 1 hour

A machine can make 503 kg bread in 1 minute.

Required 300 kg dough in 6 minutes

= 50 kg in 1 minute

= 50503⁄ = 3 minutes.

Let the number be x and y then required Sum of reciprocal = 1/x +1/y => x+y/xy => 55/600 = 11/120

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Going through options 3125736 is the only number that is divisible by 3 as well as 8.

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