Question

Crane A can unload a ship in 10 hours and crane B can unload it in 14 h. How long will it take the two cranes to unload the ship working together? What is the correct equation to solve this problem?
A. \frac{ x }{10}+\frac{ 14 }{ 14 }=1
B. \frac{ x }{10}+\frac{ x }{ 14 }=1
C. \frac{ x }{10}+\frac{ x }{ 14 }=70
D. \frac{ 10 }{x}+\frac{ 14}{ x}=1

Answer 1

@jim_thompson5910

Answer 2

what did you get

Answer 3

idk what to do

Answer 4

Crane A can unload a ship in 10 hours

so in one hour it can do 1/10 of the job

Answer 5

crane B can unload it in 14 h

so in one hour it can do 1/14 of the job

Answer 6

in x hours, crane A can do x/10 of the job (multiply 1/10 by x)

in x hours, crane B can do x/14 of the job (multiply 1/14 by x)

Answer 7

in x hours, the two cranes combined working together can do the job in x/10 + x/14 hours

Answer 8

this is assuming they don't get in the way of each other or slow each other down

Answer 9

oops i meant to say

in x hours, the two cranes combined working together can do x/10 + x/14 of the job

Answer 10

since you want them to do a full job, this means that

x/10 + x/14 = 1

Answer 11

1 is usually used to denote 1 full job (for workrate problems)

Answer 12

so the answers B?

Answer 13

yeah