Question

tinu is cycling at the speed of 10 km/h. how long will she take to make a round of a circular field of radius 50 cm ?(π = 22/7)​

Answer 1

Heya friend,

Here is it:

We know,

speed = $\frac{distance}{time}$

or,

time  =  $\frac{distance}{speed}$

Here,

Tanu is making one round of the circular field, and,

the distance will be the perimeter of this field, i.e.

distance = 2πr

              = 2 × $(\frac{22}{7} )$ × 50 cm

              =  $(\frac{22}{7} )$ × 100 cm

              = 314 cm

speed = 10km/hr

          = 10 × 1000 × 100 cm/hr

         = 10 × $10^{5}$ cm/hr

So,

time = $\frac{314}{10^{6} }$ hr

       = $(\frac{314}{10^{6} } )$ × 60 × 60 sec

       = 1.1304 seconds

Thanks !

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