Let us consider number of days as ‘x’ days
Weight of dust (kg) |
1.2 × 108 |
4.8 × 108 |
|
15 |
x |
(1.2 × 108)/15 = (4.8 × 108)/x
By cross-multiplying
(1.2 × 108) x = (4.8 × 108) × 15
x = (4.8 × 108 × 15) / (1.2 × 108)
= 60
∴ The dust of 4.8 × 108 kg will be picked up in 60 days from the atmosphere.