Question 983330
Hi there,
R varies inversely with the time T. 
R = k/T
To find k the constant of proportionality
R = k/T
56 = k/9
Cross multiply
k = 9 x 56
k = 504
Formula: R = 504/T
Find the speed of a car that travels 
the given distance in 8 seconds.
R = 504/T
R = 504/8
R = 63mph.
Hope this helps:-)