Question

The radius of the wheel of a truck is 70 cm. It makes 250 revolutions per minute. Find the speed of the truck in km/hr.

Answer 1

Answer:

given ;

Radius of the wheel of bus = 70 cm = 0.7 m

Distance covered in one revolution

= Circumference of the wheel

= 2πr

= 2×22/7 × 0.7

= 4.4 m

Speed = Distance/Time

66 km/hour

= 66000/60 m/min

= 1100 m per min

No of revolution to move at 1100m/min speed

= 1100/4.4

= 250 revolutions

Read more on Brainly.in - https://brainly.in/question/1075978#readmore

Step-by-step explanation:

Answer 2

Answer:

66 km/h

Step-by-step explanation:

Find the distance of 1 revolution:

1 revolution = 2πr

1 revolution = 2π(70) = 440 cm

Find the distance of 250 revolutions:

1 revolution = 440 m

250 revolution = 440 x 250 = 110000 cm = 1.1 km

Find the speed:

1 min = 1.1 km

60 mins = 1.1 x 60 = 66 km

⇒ Speed = 66 km/h

Answer: The speed is 66 km/h