Question

if you cover 10 kilometer in 2.5 minutes what is the speed of the car

Answer 1

$speed \: = \frac{distance}{time} \\ = \frac{10}{ \frac{2.5}{60} } \\ = \frac{10 \times 60}{2.5} \\ = 60 \times 4 \\ speed = 240km \: per \: hour$
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Answer 2

speed = 10 /2.5 = 4 kmpm

1 kmpm = 1000m/60s  = 16.6667 m/s

So 4 kmpm = 66.66 m/s