30 men took a dip in a water tank 20m long and 15m broad on a religious day.If the aveage water displacement of water by a man is 2m3, then the rise in the water level in the tank will be --

30 men took a dip in a water tank 20m long and 15m broad on a religious day.If the aveage water displacement of water by a man is 2m3, then the rise in the water level in the tank will be -- Correct Answer 20 cm

30 জন লোকের পানির প্রয়োজন = (30 × 2) m3 = 60m3 এখন, ধরি, উচ্চতা = hm ∴ 20 ×15 × h = 60 ⇒h = 60300m ⇒h = 15m ⇒h = 15×10 m  ⇒h = 20cm
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