Question

a person goes to office from his home in 20 minutes and return to home in 30 minutes if distance between office and home is 20 find average speed of person kilometre and in kilometre per second​

Answer 1

☯ GiveN :

• Distance from home to office = 20 m
• Time taken while going to office = 20 mins = 20 * 60 s = 1200 s
• Time taken while going to office = 20 mins = 30 * 60 s = 1800 s

$\rule{200}{1}$

☯ To FinD :

We have to find the average speed of the man.

$\rule{200}{1}$

☯ SolutioN :

We know that,

$\small{\implies{\boxed{\boxed{\sf{Average \: speed = \dfrac{Total \: Distance}{Total \: Time} }}}}}$

Firatly we will find total distance covered by man.

↪Total distance covered = distance covered while going to office + distance covered while going to home

↪Total distance covered = 20m + 20m

↪Total distance covered = 40 m

$\rule{150}{2}$

Now,

We will find total time taken

↪Total time taken = Time taken while going to office + Time taken while going to home

↪Total time taken = 1200 + 1800

↪Total time taken = 3000 s

$\rule{200}{2}$

↪Average speed = 40/3000

↪Average speed = 0.0134 m/s

$\Large{\implies{\boxed{\boxed{\sf{Average \: Speed = 0.0134 \: ms^{-1} }}}}}$