Question

Poornima covers first lap in 55 seconds, second lap in 50 seconds
and hird lap in 45 seconds of a 300 metre running race. What was her
average speed of running?​

Answer 1

$\texttt{She took 3 rounds.}$

$\texttt{total distance travelled = 3×300 = 900 m}$

$\texttt{Total time taken = 55+50+45 = 150 s}$

$\texttt{Av. speed \;} \mathtt{ = \frac{total \; distance}{total \; time \; taken}}$

$\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\; \mathtt{ = \frac{900}{150} = 60 m/s}$

Answer 2

Given data : Poornima covers first lap in 55 seconds, second lap in 50 seconds

and third lap in 45 seconds of a 300 metre running race.

To find : Poornima's average speed of running ?

Solution : Now according to given,

First lap :

• Time taken = 55 sec
• Distance covered = 300 m

Second lap :

• Time taken = 50 sec
• Distance covered = 300 m

Third lap :

• Time taken = 45 sec
• Distance covered = 300 m

Now, from first, second and third lap :

⟹ Total distance covered = {300 + 300 + 300} m

⟹ Total distance covered = {600 + 300} m

⟹ Total distance covered = 900 m

Similarly,

⟹ Total time taken = {55 + 50 + 45} sec

⟹ Total time taken = {105 + 45} sec

⟹ Total time taken = 150 sec

Now,

⟹ Average speed = total distance/total time

⟹ Average speed = 900/150

⟹ Average speed = 90/15

⟹ Average speed = 6 m/s

Answer : Hence, the average speed of running of the poornima is 6 m/s.

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