Water level in a well was 20m below ground level. During rainy season, rain water collected in different water tanks was drained into the well and the water level rises 5 m above the previous level. The wall of the well is 1m 20 cm high and a pulley is fixed at a height of 80 cm. Raghu wants to draw water from the well. The minimum length of the rope that he can use is

⇒ Since, the height of the fixed pulley from the bottom of the well is 2m and in rainy season water level raises and lies below 15m from the ground level

∴ 15 + 2 = 17m

⇒ extra meter rope to pull the water so add one m

∴ 17 + 1 = 18m

⇒ Option A is incorrect as the rope required is 18m not 17m

⇒ Option B is correct as rope required as 18m

⇒ Option C is incorrect as the rope required is 18m not 96m

⇒ Option D is incorrect as the rope required is 18m not 97m