Question

# A car travels a distance of 15 km in 20 minutes. Find the speed of the car in $$m s^{-1}$$

Solution
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#### Speed of car in $$m s^{-1}$$Convert 15 km into meters1 km = 1000 m15 km = $$1000 \times 15$$ = 15000 m ......(i)Convert minutes into seconds1 minutes = 60 sec.20 minutes = $$60 \times 20$$ = 1200 sec ........ (ii)Speed of car = $$\dfrac{distance}{time}$$Speed of car = $$\dfrac{15000 m}{1200 sec}$$ = $$12.5 m s^{-1}$$

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