Answer:
When the average speed for a journey of 100 km is doubled,
the time taken is halved. The time taken, t hours is said
to be inversely proportional to the speed u km per hour. As
u increases, t decreases according to the algebraic relationship
t = 100 / u
In general when y is inversely proportional to x there is
an algebraic relationship between x and y of the form y =
a / x
Where a is a constant. y is inversely proportional to x is
often written y 1 / x .
