In 15 days, the earth picks up 1.2×108 kg of dust from the atmosphere. In how many days it will pick up 4.8×108 kg of dust ?
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Dust of 1.2×108 kg is picked up in 15 days Let the dust of 4.8×108 will be picked up in x days Therefore. Dust (in kg)1.2×1084.8×108Days 15x ∴1.2×1084.8×108=4.8×108x(constant)⇒x×1.2×108=4.8×108×15⇒x=4.8×108×151.2×108=4×108×15108=60 ∴ Days = 60