Question

A boy cycled at an average speed of 21km/h for 40 minutes. What distance did he cover? please give the answer quickly

Answer 1

Given :-

• Total Time = 40 min.

$\sf{\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:=\:\dfrac{40}{60}}$hr

• Average Speed = 21 km/hr

Answer :-

• 14 km

Formula Used :-

$\sf{ \boxed{ \boxed{Average\:Speed\:=\:\dfrac{Total\: Distance}{Total\:time}}}}$

Solution :-

$\bf{Average\:Speed\:=\:\dfrac{Total\: Distance}{Total\:time}}$

$\sf{\dfrac{\:\:\:\:Total\: Distance}{\dfrac{40}{60}}\:=\:21}$

$\sf{\:\:\:\:Total\: Distance\:=\:21\times\dfrac{40}{60}}$

$\sf{\:\:\:\:Total\: Distance\:=\:14\:km }$

Answer 2

$\Large{\underline{\underline{\bf{Given\: information:-}}}}$

$\rm{Average \: speed =\: 21 Km/h}$

$\rm{Time\: taken =\: 40 minutes}$

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$\Large{\underline{\underline{\bf{To \: Find:-}}}}$

$\rm{What\: distance \:did \:he \:cover?}$

$\rm{Distance=?}$

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$\Large{\underline{\underline{\bf{Formula\: used:-}}}}$

$\rm{Average\: speed= \frac{Total\:Distance}{Total \:Time \:Taken}}$

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$\Large{\underline{\underline{\bf{Solution:-}}}}$

${\bold{\underline{\underline{As\: we \: Know \:all \: the \: units \: are \: in \: hr :}}}}$

$\rm{so\: 40 minutes= \frac{40}{60}=\frac{2}{3}}$

${\bold{\underline{\underline{Now\: Putting\: values\: in \: the \: given \: formula}}}}$

$\rm{Average\: speed= \frac{Total\:Distance}{Total \:Time\: Taken}}$

⟹$\rm{21Km/h=\frac{Distance}{\frac{2}{3}}}$

⟹$\rm{21\times\:\frac{2}{3}=Distance}$

⟹$\rm{14=Distance}$

${\rm{\boxed{\boxed{Distance=14Km}}}}$

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$\Large{\underline{\underline{\bf{Thanks}}}}$