Answer:

Step-by-step explanation:
According to the Question ,
- Speed = 80km/hr
- Time = 2hr
- Distance = ?
We know the formula of speed as ,

Answer:
when x=4
the value of x(14 - x)=4(14-4)=4×10=40
6/100*x + 8/100 (18000-x) = 1290
Let (8*18000/100)=a for simplicity.
6/100x + 8/100x + a =1290
14/100x=1290-a
x=(1290-a)*100/14
should be 7500