"A manufacturer builds a machine which will address 500 envelopes in 8 minutes.
Channel: Doubtnut
Date: 2020-04-05

"A manufacturer builds a machine which will address
 500 envelopes in 8 minutes. He wishes to build another machine so that when
 both are operating together they will address 500 envelopes in 2 minutes. The
 equation used to find how many minutes x it would require the second machine
 to address 500 envelopes alone, is
a. `8-x=2`
b. `1/8+1/x=1/2`
c. `(500)/8+(500)/x=500`
d. `x/2+x/8=1`"