Please help with practice problem.

Quantities and Units Useful hints: 1 km = 1000 m, 1 m = 100 cm 1 mi = 1760 yd, 1 yd = 3 ft, 1 ft = 12 in, and 1 in = 2.54 cm 1 2= 1000ml, 1ml = 1em3 Solve the following Questions: a. The approximate distance between sun and earth is 150 million kilometers. How many football fields (each being 100 yd long) would fit between earth and sun? b. Usain Bolt ran a distance of 100 m in 9.58 s, thereby setting a world record. Calculate the speed of Usain Bolt in miles per hour during that race. c. Radius of earth if 6400 km (assuming earth to be a perfect sphere). Find the surface area of the earth in in2. d. Given: 1 gallon = 128 fl oz and 1 fl oz = 30 ml. Then, 1 gallon = 1 = cm3 = in3