Question

Mary cycle at 6km per hour. how long will she take to reach her aunt's house which is 12km away? if she cycle at a speed of 4 km/hr, how long would she take​

Answer 1

Step-by-step explanation:

speed= distance/time

Answer 2

AnswEr :

$\bold{1st \:Situation} \begin{cases}\sf{Distance=12 \:Km} \\ \sf{Speed=6 \:Km/hr}\\ \sf{Time=?}\end{cases}$

$\maltese \: \Large\boxed{\sf Distance = Speed \times Time}$

$\longrightarrow \tt Distance = Speed \times Time \\ \\\longrightarrow \tt 12 \:Km= 6 \:Km/hr\times Time \\ \\\longrightarrow \tt \cancel\frac{12 \:Km}{6 \:Km/hr} = Time \\ \\\longrightarrow \orange{\tt Time = 2 \:hr}$

⠀

∴ Time taken is 2 hr, at speed 6 Km/hr.

$\rule{300}{2}$

$\bold{2nd \:Situation} \begin{cases}\sf{Distance=12 \:Km} \\ \sf{Speed=4 \:Km/hr}\\ \sf{Time=?}\end{cases}$

$\maltese\: \Large\boxed{\sf Distance = Speed \times Time}$

$\longrightarrow \tt Distance = Speed \times Time \\ \\\longrightarrow \tt 12 \:Km = 4 \:Km/hr \times Time \\ \\\longrightarrow \tt \cancel\frac{12 \:Km}{4 \:Km/hr} = Time \\ \\\longrightarrow \orange{\tt Time = 3\:hr}$

⠀

∴ Time taken is 3 hr, at speed 4 Km/hr.

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