Question

16. (4)( therefore ) Part emptied in ( 1 mathrm{min}=frac{1}{3}+frac{1}{5}=frac{8}{15} )
( therefore ) Required taken time ( =frac{1}{frac{8}{15}}=frac{15}{8}=1 frac{7}{8} mathrm{min} )

# 16. A water tank has two holes. The Ist hole alone makes the tank empty in 3 min and 2nd hole alone makes the tank empty in 5 min. If water leaks out a constant rate, how long in minutes does it. If both the holes together empty the tank? RRB NTPC (Phase 1) 2016 (1) 7/8 (2) 24 (3) 15 (4) 17

Solution