Question

A boy cycles a distance of five miles at a speed of 15 miles per hour and then cycles a
was the duration of the entire journey?
O 1 hour
O 40 minutes
O 50 minutes
30 minutes
O 45 minutes​

Answer 1

Mark as branliest answer

Radius of the wheel =r=

2

60

=30 cm

Circumference of the wheel =2πr=2×

7

22

×30=

7

1320

cm

Distance covered in 1 revolution =

7

1320

cm

Distance covered in 140 revolutions =

7

1320

×140=26400 cm=264 m=

1000

264

km

Distance covered in one minute = Distance covered in 140 revolutions =

1000

264

km

Duration :1 hour

Answer 2

Given: A boy cycles a distance of five miles at a speed of 15 miles per hour.

To find: We have found the time.

Solution:

We know that speed is a ratio of distance to time.

S=D/t

Where S is the speed of the boy which is equal to 15 miles per hour.

D is the distance that is equal to 5 miles.

t is the time required to cover the journey.

So, time will be-

$\frac{5}{15} = \frac{1}{3}$

So, time is 1/3 hour means 1/3×60=20 minutes.

The duration of the entire journey is 20 minutes.