Answer
64.0 s
Work Step by Step
distance in m = 10.0 $\times$ 1000 = 1.00 $\times$$10^{4}$
$time_{younger}$
= distance / average speed
= (1.00 $\times$$10^{4}$) / 4.39
$\approx$ 2.2779 $\times$$10^{3}$ s
$time_{older}$
= distance / average speed
= (1.00 $\times$$10^{4}$) / 4.27
$\approx$ 2.3419 $\times$$10^{3}$ s
2.3419 $\times$$10^{3}$ - 2.2779 $\times$$10^{3}$
$\approx$ 64.0 s
