a object travel along a horizontal straight past a constant rate the object travel 1\20 of the length of the past is 3\4 secound at the rate

How to do this , and can some one explain

Do, h = (7, 9) (14, 18) the scale factor is

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.