Question

A car travels a distance of 15 km in 20 minute.
Find the speed of the car in (i) km h-1 (ii) m s-1​

Answer 1

Answer:

(i) Speed = 45 km/hr

(ii) Speed = 12.5 m/s.

Explanation:

$\blue\bigstar$Given -

• Distance = 15 km.
• Time = 20 mins.

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$\purple\bigstar$To Find-

• (i) km h^-1
• (ii) m s^-1

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$\pink\bigstar$Solution -

$\red\implies$ Formula to be used -

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

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$\orange\implies$ Answer(i)Speed in km/hr.

$\rightarrow$ 20 mins to hours = $\frac{20}{60}=\frac{1}{3}$

$= \frac{15}{1} \div \frac{1}{3} \\ \\ = \frac{15}{1} \times \frac{3}{1} \\ \\ = 15 \times 3 \\ \\ 45$

Speed = 45 km/hr.

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$\green\implies$ Answer (ii)Speed in m/s -

$\rightarrow$ 15 km to m = 15×1000 = 15000 m

$\rightarrow$ 20 mins to secs = 20×60= 1200 s.

$= \frac{15000}{1200} \\ \\ = 12.5$Speed= 12.5 m/s.