Question

tina is cycling at a speed of 10 km/h.how long will she take to make a round of a circular field of radius 50 cm?

Answer 1

Given,
No.of rounds = 1
Speed = 10km/hr
Time = Distance / Speed
= Circumference of the circle/Speed

$= \pi {r}^{2}cm \: \div \: 10 \times 100000 \frac{cm}{hr} \\ = \pi \times 50 \times 50 \: \div \: 100000 \times 10 \frac{cm}{hr} \\ = \frac{11}{14}hr.$
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Answer 2

Given :

Radius of circular field = 50 cm

To Find :

Tina is cycling at a speed of 10 km/h.how long will she take to make a round of a circular field of radius 50 cm?

Solution:

Radius of circular field = 50 cm

Circumference of circular field =$2 \pi r = 2 \times 3.14 \times 50 =314 cm$

1 km = 100000 cm

10 km = 1000000 cm

Speed of cycle = 10 km/hr

Speed of cycle = 1000000 cm/hr

Time =$\frac{Distance}{Speed}$

Time =$\frac{314}{1000000}$

Time =0.000314  hour

Hence She will take 0.000314  hour to make a round of a circular field of radius 50 cm