Question

Air outside a water lake is blowing at -40°C
takes 10 hours for first two centimeter of ice laver
to form over the lake. Time taken to form next four
centimeter of ice layer formation will be
(1) 20 hours
(2) 40 hours
(3) 60 hours
(4) 80 hours​

Answer 1

Outside Air Temperature is blowing at -40°C.

The time taken for the formation of two centimeters of an ice layer is = 10 hours.

So time taken to form the next four centimeters of ice layer will be = 20 hours.

The right answer is 1) 20 hours.

For 2 layers ice formation = 10 hours

So next 4 layers ice formation = 20 hours.