Which of the following best represents the speed of halley's comet when it is nearest to earth?
a) 1 × 105 kilometers per hour
b) 1 × 10-5 kilometers per hour
c) 1 × 105 kilometers per year
d) 1 × 10-5 kilometers per year

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?