A car moves at a constant speed of 56.4 km per hour. How much distance does it cover in 3.5 hours?

Given:

Speed per hour = 56.4 km

Total time = 3.5 hours

Distance covered = ?

We know the formula,

Distance = Speed x Time

Substituting the values in above, we get:

Distance = 56.4 km x 3.5 hours

Sum of the decimal places in given decimals = 1 + 1 = 2

So, the product contains 2 places of decimal

$\begin{matrix} & & 5 & 6 & 4 \ \times & & & 3 & 5 \ \hline & 2 & 8 & 2 & 0 \ 1 & 6 & 9 & 2 & \times \ \hline \bold{1} & \bold{9} & \bold{7} & \bold{4} & \bold{0} \end{matrix}$

∴ 56.4 km × 3.5 hours = 197.40 km = 197.4 km

Hence, the distance covered by the car = 197.4 km