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Total surface area = 231 cm2 Curved surface area = 2/3 x 231 = 154 cm2 Curved surface area of cylinder = 2πrh ⇒ 2πrh = 154 ⇒ 2 × (22/7) × r × h = 154 ⇒ r × l = 24.5 Total surface area of cylinder = 2πr(r + h) ⇒ 2πr(r + h) = 231 ⇒ r(r + h) = 36.75 ⇒ r2 + rh = 36.75 ⇒ r2 = 36.75 - 24.5 ⇒ r2 = 12.25 ⇒ r = 3.5 cm Volume of cylinder = πr2h ⇒ π × r × (r × h) ⇒ π × 3.5 × 24.5 ⇒ 269.5 cm ∴ The volume of the cylinder is 269.5 cm3 .
A train can cross a pole, a bridge of 510 meter long and platform of 450 meter long in 11 seconds, _____ seconds and 26 seconds, respectively.
Th...
1280 metres long train crosses a man who is moving in the same direction with a certain speed in 20 seconds. If the same train can cross a pole in 16 se...
A train can cross a pole in 6 seconds while it can cross a 240 metres long platform in 18 seconds. Find the time (in hours) taken by the train to cover ...
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Two trains A and B, were proceeding in the same direction on parallel tracks at 23 km/hr and 77 km/hr respectively. A man noticed that it took exactly 1...
A train 450 m long running at 72 km/hr takes 45 seconds to cross a bridge The length of the bridge is
