Question

A car takes 20 minutes to cover a distance of 25 km. Calculate its speed in km/h and m/s.

Answer 1

Answer:

Speed in km/h = 75 km/h

Speed in m/s = 20.8333 m/s

Answer 2

$Distance \: covered \: (d) = 25 \:km$

$Time \: to \: cover \: 25 \:km (T)\\ = 20 \: minutes\\= 20 \times \frac{1}{60} \: hours \\= \frac{1}{3} \: hours$

$Speed \: of \:the \:car (s) = \frac{distance }{Time} \\= \frac{25\:km }{\frac{1}{3} \: hours } \\= 25 \times 3 \\= 75 \: km/h \: --(1)$

$= 75 \times \frac{1000 \:m }{ 60\:s \times 60\:sec} \\= 75 \times \frac{5}{18} \\= \frac{125}{6} \\= 20.83\: m/s\: --(2)$

Therefore.,

$\green { i )Speed = 75\:km/h }$

$\green { ii )Speed = 20.83 \:m/s}$

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