Question

the diameter of the wheels of a bus is 142 cm . how many revolutions per minute must A wheel make in order to move at a speed of 66 km / hr

take pi = 22 / 7

plz explain very very clearly plz I am facing so much difficulty ​

Answer 1

Given

• Diameter of the wheels of a bus is 142 cm.
• Wheel make in order to move at a speed of 66 km / hr.

We Find

Revolutions per minute must a wheel make in order to move at a speed of 66 km / hr

We Know

☆ Circumference of wheel :- 2 × 22/7 × Radius

= 2 × 22/7 × 71

= 446.28 CM

☆ distance traveled in 60 min = 66 × 1000 × 100 cm

So, distance traveled in 1 min = $\frac{60}{66} ×1000×100 cm \: \\ \\ =110000 cm$

According to the question

Now , We Find the revolution in 1 min, So :-

Revolution in 1 min = $\frac{110000}{446.28}$

Revolution in 1 min = $\frac{110000}{446.28}$

Revolution in 1 min = $\cancel\frac{110000}{446.28}$

Revolution in 1 min = $\boxed {\red{246.48}}$

Hence, The required answer is 247 CM ( Approximately ).

Answer 2

Step-by-step explanation:

Given

Diameter of the wheels of a bus is 142 cm.

Wheel make in order to move at a speed of 66 km / hr.

We Find

Revolutions per minute must a wheel make in order to move at a speed of 66 km / hr

We Know

☆ Circumference of wheel :- 2 × 22/7 × Radius

= 2 × 22/7 × 71

= 446.28 CM

☆ distance traveled in 60 min = 66 × 1000 × 100 cm

So, distance traveled in 1 min = \begin{gathered}\frac{60}{66} ×1000×100 cm \: \\ \\ =110000 cm \\ \\\end{gathered}

66

60

×1000×100 cm

=110000 cm

According to the question

Now , We Find the revolution in 1 min, So :-

Revolution in 1 min = \begin{gathered} \frac{110000}{446.28} \\ \\\end{gathered}

446.28

110000

Revolution in 1 min = \begin{gathered} \frac{110000}{446.28} \\ \\\end{gathered}

446.28

110000

Revolution in 1 min = \begin{gathered} \cancel\frac{110000}{446.28} \\ \\\end{gathered}

446.28

110000

Revolution in 1 min = \begin{gathered} \boxed {\red{246.48}} \\ \\\end{gathered}

246.48

Hence, The required answer is 247 CM ( Approximately ).