Question

Dinesh takes 20 minutes to cover a distance of 5 km on a bicycle. Calculate his average speed in km/h.​

Answer 1

Answer:

1km/4mins

Explanation:

Answer 2

Answer:

15 km/h

Explanation:

As per the information provided in the question, We have :

• Dinesh takes 20 minutes to cover a distance of 5 km on a bicycle.

We are asked to find average speed in km/h.

We know that,

$\begin{gathered} \longmapsto\rm {Speed_{(avg)} = \dfrac{Total \; distance}{Total \; time} }\\\end{gathered}$

Here, total distance is 5 km & Total time is 20 mins.

Converting time into hours :

$\begin{gathered} \longmapsto\rm {Time_{(Total)} = \dfrac{20}{60} }\\\end{gathered}$

$\begin{gathered} \longmapsto\rm {Time_{(Total)} = 0.33}\\\end{gathered}$

Finding average speed :

$\begin{gathered} \longmapsto\rm {Speed_{(avg)} = \dfrac{Total \; distance}{Total \; time} }\\\end{gathered}$

Substituting the values.

$\begin{gathered} \longmapsto\rm {Speed_{(avg)} = \dfrac{5}{0.33} \: km \: {h}^{ - 1} }\\\end{gathered}$

$\begin{gathered} \longmapsto\rm {Speed_{(avg)} = 15 \: km \: {h}^{ - 1} }\\\end{gathered}$

∴ Average speed of dinesh is 15 km/h.

Points to remember :

• Acceleration is the rate of change in velocity.
• Velocity, Displacement, Acceleration & force are vector quantities.
• Acceleration is denoted by A.
• Negative acceleration is retardation.
• It is also known as deceleration.