51 x
5
¼
18
5
x¼ 3 :6 hours
- Letx¼the time it takes if both people work together.
1
12
xþ
1
15
x¼1 LCD¼ 60
605
1
x
121
þ
604
1
x
151
¼ 60 1
5 xþ 4 x¼ 60
9 x¼ 60
9 x
9
¼
60
9
x¼ 6
2
3
or 6:67 hours
- Letx¼the time it takes if both people work together.
1
90
xþ
1
120
x¼1 LCD¼ 360
3604
1
x
901
þ
3603
1
x
1201
¼ 360 1
4 xþ 3 x¼ 360
7 x¼ 360
71 x
7
¼
360
7
x¼ 51
3
7
or 51:43 hours
190 LESSON 17 Solving Work Problems