5to the -8 power times 5 to the 4th power

Askyscraper is 396 meters tall. at a certain time of day, it casts a shadow that is 332 meters long.at what angle is the sun above the horizon at that time?

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.