3. A car takes 40 minutes to travel the first 60 km, 1 h and 30 minutes for the next 100
to travel another 15 km. Find the average speed of the car in the whole journey
Answers
Step-by-step explanation:
A car travels 40 km in 30 minutes and the next 40 km in 40 minutes
Calculate the average speed for the entire journey.
___________________________________________
distance₁ = 40 km
time₁ = 30 min = 30/60 hour = ¹/₂ hour
distance₂ = 40 km
time₂ = 40 min = 40/60 hour = ²/₃ hour
average \ speed=\frac{total \ distance}{total \ time}average speed=
total time
total distance
\begin{gathered}average \ speed=\frac{40+40}{\frac{1}{2}+\frac{2}{3} } \\\\ average \ speed=\frac{80}{\frac{3+4}{6} } \\\\ average \ speed=\frac{80 \times6}{7} \\\\ average \ speed=\frac{480}{7} \\\\ average \ speed=68.57 kmph\end{gathered}
average speed= 21 + 3240+40
average speed= 63+480
average speed= 780×6
average speed=7480
average speed=68.57kmph
Step-by-step explanation:
✅✅✅✅✅