Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: · Marks: · Difficulty:
Water flows through a cylindrical pipe of internal diameter 7 cm at 2 m per second. If the pipe is always half full, then what is the volume of water (in litres) discharged in 10 minutes?
(a)2310
(b)3850
(c)4620
(d)9240
Answer
Answer (as printed): C
Explanation
Volume of water flown in 1 sec. $$=\left(\frac{22}{7} \times \frac{7}{2} \times \frac{7}{2} \times 200\right) \mathrm{cm}^{3}=7700 \mathrm{cm}^{3} .$$ Volume of water flown in $10 \mathrm{min} .=(7700 \times 60 \times 10) \mathrm{cm}^{3}$ $$=\left(\frac{7700 \times 60 \times 10}{1000}\right) \text { litres }=4620 \text { litres } .$$