<PRE><B>Question 441064</B>
The heights, in metres, or two hot-air balloons are measured at the same time. these formulae give their heights t seconds after that time.
- Balloon 1: 500-0.5t
- Balloon 2: 50+0.4t 
a)Write down an equation and solve it to work out how many seconds it will take for the two balloons to be at the same height.
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Solve:
500 - 0.5t = 50 + 0.4t
0.9t = 450
t = 500 seconds
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b) What will the height be at the time in part a? 
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h(500) = 50 + 0.4(500)
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= 40 + 200
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= 240 ft.
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Cheers,
Stan H.</PRE>