Math, asked by jarizaidi79, 4 months ago

the distance between two places is 120 km. A car at a certain speed can cover travelling the distance in 2 hours 30 minutes. by how many km/h should the speed of the car be incresed for it to takes 30 minutes less to cover the Distance​

Answers

Answered by nishit271
0

Answer:

12 km/hr

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Answered by ravan2009
5

Question:

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

Given:

The Distance between two places=120 km

Time taken to cover the distance is 2 hours 30 minutes

To Find:

The distance

Formula used:

\textsf{speed}=\frac{distance}{time}

Answer:

The Distance between two places = 120 km

Time taken to cover the distance is 2 hours 30 minutes

Converting minutes ⇒ hours

Converting factors

  • 1 hour = 60 minutes

  • 60 minutes = 1 hour

       =(2\times60)min+30min\\\\=120min+30min\\\\ =150min=\frac{150}{60} \: hour\\\\= \frac{5}{2} hour

\textsf{speed}=\frac{distance}{time}

        =\frac{120}{5}}\times 2km/hr\\\\=\frac{120}{5}}\times 2km/hr\\\\=\frac{240}{5}km/hr\\\\ = 48 km/hr

  • New time = 2 hr 30min-30min

               = 2 hour

  • Distance = 120km

\textsf{speed}=\frac{distance}{time}

           =\frac{120}{2} km/hr\\\\=60 km/hr

  • Increase in speed=(60-48)km/hr  

                            = 12km/ hr

Answer:

  • Distance = 120 km

  • Speed = 60 km/hr

  • Increase in speed = 12  km /hr
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