an airplane flies 169 km in 4 hours 20 minutes. What is its average speed in kilometers
+33661 You probably mean "What is its average speed in kilometres per hour?"
speed = distance/time
20 minutes is 1/3 of an hour so
$${\mathtt{speed}} = {\frac{{\mathtt{169}}}{\left({\mathtt{4}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}\right)}} \Rightarrow {\mathtt{speed}} = {\mathtt{39}}$$
So speed = 39km/hr
(Presumably not a commercial flight!).
.
+33661 You probably mean "What is its average speed in kilometres per hour?"
speed = distance/time
20 minutes is 1/3 of an hour so
$${\mathtt{speed}} = {\frac{{\mathtt{169}}}{\left({\mathtt{4}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{3}}}}\right)}} \Rightarrow {\mathtt{speed}} = {\mathtt{39}}$$
So speed = 39km/hr
(Presumably not a commercial flight!).
.
