Question

a car travels at a speed of 20 km/h for 2hrs and at 60km/h for the next 2hrs calculate the average speed.
(20 points)​

Answer 1

Answer:

160 km

Explanation:

first 2 hours,

distance=speed×time

=20×2

=40km

second 2 hours,

=60×2

=120km

total distance =120 +40

=160km

average speed=20+60/4

=80/4

=40km/h is average speed

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Answer 2

$\mathfrak{ \huge\underline\red{question} : - }$

a car travels at a speed of 20 km/h for 2hrs and at 60km/h for the next 2hrs calculate the average speed.

$\textbf{ \huge \underline {\underline\red{solution} : - }} \\ \\ \textbf{ \underline {\underline\red{given} : - \: car \: travel \: at \: speed \: of \: }} \\ \textbf {\underline{20 \: km \: per \: hour \: for \: 2 \: hr \:and }} \\ \textbf{\underline{60 \: km \: per \: hour \: for \:next \: 2 \: hr \: . }} \\ \\ \textbf {\underline{\underline\red{to \: find} : - average \: speed \: of \: car .}} \\ \\ \textbf{now} \\ \textbf{\underline\red{to \: calculate \: distance \: travel \: by \: car}} \\ \textbf{\underline\red{with \: diffrent \:diffrent \: speed \: in \: 2 \: hr. }} \\ \\ = > \textbf{20 \: km \: per \: hour} \times \textbf{2 \: hour = 40 km } \\ \\ = > \textbf{60 \: km \: per \: hour} \times \textbf{2 \: hour = 120 km } \\ \\ \textbf{\underline\red{now \: by \: adding \: the \: distance}} \\ \\ = > \textbf{40 \: km \: + 120 \: km \: = 160 \: km} \\ \\ \textbf{\underline\red{now \: adding \: the \: time \: \: of \: car } }\\ \textbf{\underline \red{in which car travel distance of 160 km. }} \\ \\ = > \textbf{2 \: hour \:+ 2 \: 2 \: hour = 4 \: hour } \\ \\ \textbf{\underline \red{car travel distance of 160 km in 4 hour . }} \\ \\ \textbf{\underline \red{average \: speed \: of \: car}} \purple{ = \frac{distance}{time} } \\ \\ \textbf{\underline \red{average \: speed \: of \: car}} \purple{ = \frac{160}{4} } \\ \\ \textbf{\underline \red{average \: speed \: of \: car = 40 \: km \: per \: hour }} \\ \\ \underline\blue{the \: average \: speed \: of \: car \: is \: 40 \: km \: per \: hour.} \\ \\ \\ \\ \fbox{i \: hope \: it \: helps \: you.}$