Question

A man walks $8$ km in$1$hour $20$ minutes. What is the speed of the man in km/hr?

Answer 1

Given that distance$=8km$

Time $=1hour20minutes$

$$\begin{gathered} =\left(\frac{60+20}{60}\right)hours \\ =\frac{80}{60}=\frac{4}{3}hours \end{gathered}$$

Speed =?

$$\begin{gathered} speed=\frac{dis\tan ce}{time} \\ =\frac{8}{{\displaystyle \frac{4}{3}}}=8\times \frac{3}{4}=6km/hr \end{gathered}$$

Therefore, the man speed is $6$km/hr