Find the speed of a car that travels 210 miles in 5 hours.

Speed = Distance ÷ Time

To find the speed of the car, we first have to identify our values so we can plug our numbers into the formula.

What we know:

Distance = 210 miles

Time = 5 hours

Now that we know our values, we can plug these numbers into our formula.

Speed = 210 ÷ 5

210 ÷ 5 = 42 miles/hr.

Therefore, the speed of the car is 42 mils/hr.

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared