Suppose a $1\mathrm{.}5-$Gbps point$-$to$-$point link is being set up between the Earth and a new lunar colony. The distance from the moon to the Earth is approximately $385,000$ km$,$ and data travels over the link at the speed of light$3\backslash$times $108$ m$/$s$.$ a$.$ Calculate the minimum RTT for the link. b$.$ Using the RTT as the delay, calculate the delay $\backslash$times bandwidth product for the link. Show all work including all calculations including any formulas used.