Question

Two taps A & B can fill tank in 10 hrs and 40 hrs respectively. In how many hrs is the tank filled, if both
the taps were opened simultaneously?

a) 5 hrs
b) 6 hrs
c) 7 hrs
d) 8 hrs​

Answer 1

step by step

a fill the tank in 10 hours

b fill the tank in 40 hours

in one hour a will fill the tank is =to 1/10

we will fill the tank is=1/40

a + b fill tanks equal to 1/10+1/40=4+1/40

=5/40

=1/8

answer=

d)8 hours