Question

A car takes 20 minutes to cover a distance of 15 km. Calculate its speed in km/ h​

Answer 1

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$\large{\mathbf{\underline{Given:-}}}$

Distance = 15Km

= 15 × 1000m

= 15000m

Time = 20min

= 20 × 60 sec

= 1200 sec

$or \: time(in \: hour) = 20 \times \frac{1}{60} \: hour$

$= \frac{1}{3} \: hour$

$speed = \frac{distance}{time}$

$speed(in \: \frac{km}{h} ) = \frac{15 \times 3}{1} = 45 \frac{km}{h}$

$speed(in \: \frac{m}{s} ) = \frac{15000}{1200} = 12.5 \frac{m}{s}$

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Answer 2

Time taken=20x60=1200s

Dist.=15x1000=15000m

Speed=15000/1200=150/12=12.5 m/s

Speed= 12.5 m/s=12.5x18/5 km/h

         =2.5x18 Km/h

         =45 Km/h

   

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