Question

if a car covers a distance 180 kilometre in 6.180 minutes find the speed​

Answer 1

Answer:

Surface area of a sphere=4πr  

2

=154cm  

2

 

⇒4×  

7

22

​  

r  

2

=154cm  

2

 

⇒r  

2

=  

4

154

​  

×  

22

7

​  

 

⇒r  

2

=  

4

49

​  

 

⇒r=  

4

49

​  

 

​  

 

∴r=  

2

7

​  

=3.5cm

Volume of the sphere=  

3

4

​  

πr  

3

 

=  

3

4

​  

×  

7

22

​  

×(3.5)  

3

 

=  

21

88

​  

×42.875‬=179.67cm  

3

Step-by-step explanation:

Answer 2

Speed = d

t

distance should be in metre so let us convert 180 km into metre

180 × 1000

= 180,000 meter

time should be in seconds so let us convert 6. 180 minutes in seconds

6. 180 × 60

= 370. 8 seconds

Speed = 180,000 × 10

3708

= 485. 43 m/s