Question

the distance between two places is 120 km. A car traveling at a certain speed can cover the distance in 2 hours 30 mints. by how many km/h should the speed of the car be increased for it to take 30 minutes less to cover the distance.
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Answer 1

Answer:

the speed before was 48 km/hour,and it should be increased by 12 km/hour hence the speed should be 60 km/hour.

Answer 2

Question:

the distance between the two places is 120 km. A car traveling at a certain speed can cover the distance in 2 hours 30 minutes. by how many km/h should the speed of the car be increased for it to take 30 minutes less to cover the distance?

Given:

• ​distance between two places = 120km
• time took to cover the distance = 2hour 30minutes = 2.5hour ( as 30minutes is half an hour)

To find:

• the speed of the car be increased for it to take 30 minutes less to cover the distance

Step-by-step explanation:

So now we can find the speed of the car when it takes 2.5hours to complete the distance,

we know,

Speed = distance / time

So speed of the car to cover 120km in 2.5hour =  120/2.5

                                                                               = 48km/hour

now we have to find the speed of the car when it takes 30 minutes less, that is,

2 hour 30miutes - 30minutes = 2hour

so,

Speed of the car to cover 120km when it takes 2hour = 120/2

                                                                                          = 60km/hour

Hence,

speed of the car be increased for it to take 30 minutes less to cover the distance = 60km/hr - 48km/hr = 12km/hr

hope this helps you!

Thanks

Gautham29:)