Question

Pipe a can fill an empty tank in 6 hours and pipe b in 8 hours . If both the pipes are opened and after 2 hours pipe a is closed, how much time b will take to fill the remaining tank ?

Answer 1

Answer:

3hours 20 minutes

Step-by-step explanation:

A=6hours

B=8hours

Both were opened for 2 hours so,

A filled 2/6 of tank

B filled 2/8 of tank

2/6+2/8 = 7/12

Tank to be filled = 5/12

Time b takes to fill 1/12 of tank =40min

So time b will take to fill 5/12 of tank = 40 × 5

=200min= 3 hours 20min