A soldier with a 24-hour pass and no special plans left the base at 10 AM and walked out into the country at 4 miles p hour. He returned on the same road at 2 miles per hour. If he arrived back at the base at 4 PM, how many miles into the country did he walk?

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.