Part 1 :-
[tex] \\ [/tex]
Given :-
- Distance = 120 km
- T = 3 hrs.
[tex] \\ [/tex]
To find :-
[tex] \\ [/tex]
We know:-
[tex] \boxed{ \rm speed = \frac{distance}{time} }[/tex]
[tex] \\ [/tex]
So:-
[tex] \dashrightarrow \sf speed = \dfrac{distance}{time} [/tex]
[tex] \\ [/tex]
[tex] \dashrightarrow \sf speed = \dfrac{120}{3} [/tex]
[tex] \\ [/tex]
[tex] \dashrightarrow \sf speed = \cancel\dfrac{120}{3} [/tex]
[tex] \\ [/tex]
[tex] \dashrightarrow \bold{ speed = 40 \: kmh {}^{ - 1} }[/tex]
[tex] \\ \\ [/tex]
Part 2 :-
[tex] \\ [/tex]
Given :-
- Distance = 400 km
- Speed = 80 km/h
[tex] \\ [/tex]
To find :-
[tex] \\ [/tex]
we know:-
[tex] \boxed{ \rm time= \frac{distance}{speed} }[/tex]
[tex] \\ [/tex]
So:-
[tex] \dashrightarrow\sf time= \dfrac{distance}{speed} [/tex]
[tex] \\ [/tex]
[tex] \dashrightarrow\sf time= \dfrac{400}{80} [/tex]
[tex] \\ [/tex]
[tex] \dashrightarrow\sf time= \dfrac{40 \cancel0}{8 \cancel0} [/tex]
[tex] \\ [/tex]
[tex] \dashrightarrow\sf time= \dfrac{40}{8 } [/tex]
[tex] \\ [/tex]
[tex] \dashrightarrow\sf time=\cancel \dfrac{40}{8 } [/tex]
[tex] \\ [/tex]
[tex] \dashrightarrow\bold{ time=5 \: hrs}[/tex]
