5 divided by 8 is 5/8 or .625, so each get 5/8 or.625 of an apple
1/4 =2/8+3/8 =5/8
1-5/8=3/8
Let the speed for the first 12 mi be x mi/h, the speed for 18 mi was (x+4) mi/h
thus given that
time=distance/speed
the average time will be:
3=(12+18)/(x+x+4)
3=30/(2x+4)
solving for x we get
3(2x+4)=30
6x+6=30
6x=24
x=4 mi/hr
Answer: 12 mi/hr
11x10=110
110+40=150
150/6=25
25-8=17
17 is the number.