Question

a train travels at a speed of 180 km/hour.how far will it travel in 4 hours?

Answer 1

distance = speed x time

distance= 180 x 4

distance= 720km

Answer 2

$speed \: of \: the \: train = 180 \: km \: per \: hour \\ time \: to \: travel = 4 \: hours \\ speed = \frac{distance \: travelled}{time} \\ distance \: travelled \: = speed \times time = 180 \times 4 = \frac{180km}{h} \times {4h} = 720km$