Question

a car travels first 100 kilometre in to whole 1 by 2 hours and next 30 kilometre in 1 by 2 hours .what is its average speed​

Answer 1

$</p><p>\huge\underline\mathfrak\red{Explanation:}$

let total time taken be T hrs

Phase 1 :-

distance travelled = 100kms

time taken = 1/2 of total time T

Phase 2 :-

distance travelled = 30kms

time taken = next 1/2 of total T

now average speed = total distance travelled / total time taken

= {(100kms / 0.5 of total) + (30kms / 0.5 of total)} / T

{since, speed = distance/time

= (130 kms/ hrs)

i.e 130 km/hr ←← ans

Hope it will help u..

Mark Brainliest!

$</p><p>\blue{\boxed{\bold{THANKS!}}}$

Answer 2

$\bold{\underline {\underline {Given:}}}$

• A car travels 100 km in 1/2 hrs.
• The same car also travels the next 30 km in 1/2 hrs.

$\bold{\underline {\underline {Find:}}}$

Average speed of the car.

$\bold{\underline {\underline {Solution:}}}$

Firt distance covered by car (D1) = 100 km

The same car travels distance (D2) = 30 km

So,

Total distance covered by car = D1 + D2

⇒ 100 + 30

⇒ 130 km

Also,

Time taken by car to cover the first distance (T1) = 1/2 hrs.

Time taken by car to cover the second distance (T2) = 1/2 hrs.

Total time taken by car to cover the total distance = T1 + T2

⇒ 1/2 + 1/2

⇒ 0.5 + 0.5

⇒ 1 hr.

Now,

Average speed = Total distance covered/Total time taken

Substitute the known values in above formula

⇒ 130/1

⇒ 130 km/hr.

•°• Average Speed of the car is 130 km/hr.