Question

A boy covers a distance of 1.2km in 40min find his speed in km per hours


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Answer 1

Answer:

∴ The speed of a boy is $1.8$ km per hour.  

Step-by-step explanation:

In context with question asked,

• We have to find the speed of a boy in km per hours.
• It is given that, a boy covers a distance of $1.2$ km in $40$ min.
• As we know that, the speed is the ratio of distance by time.
• The given time is in minutes.
• Converting $40$ minutes into hours, it becomes

      $40$ minutes = $\frac{40}{60}$ = $\frac{2}{3}$ hours     ( ∵ $1$ hour = $60$ minutes)

• Now,

    Speed of a boy = $\frac{distance}{time}$

                           = $\frac{1.2}{\frac{2}{3} }$

                           = $\frac{1.2 \times 3}{2}$

                           = $\frac{3.6}{2}$

                           = $1.8$ km per hour

• ∴ The speed of a boy is $1.8$ km per hour.                

Answer 2

Answer:

The speed will be 1.8 km/hr

Step-by-step explanation:

Here the distance traveled is given to be 1.2 km

Also, the time taken to cover the distance is given to be 40 minutes

We will first convert the time into hours

60 minutes = 1 hour

40 minutes = 40/60 hours

= 2/3 hour

We have to find the speed

speed = distance/time

= 1.2 × (3/2)

= 1.8 km/hr