A car travels 270 km in 4.5 hours. Calculate:

(i) its speed;

(ii) how far will it go in 7 hours at this speed; and

(iii) how long will it take to travel 300 km at this speed.

Solution

Given,
Distance travelled by the car = 270 km

Total time for travel = 4.5 hours

i) Speed of the car, v = $\frac{Distance travelled}{Time taken}$

= $\frac{270}{4.5} = 60 k m / h r$

ii) Speed = 60 km/hr

Time taken = 7 hours

Distance travelled = $Speed \times time$

= 420 km

(iii) Speed = 60 km/hr

Distance to be travelled = 300 km

Time taken = $\frac{Distance}{Speed}$

= $\frac{300}{60} = 5 h o u r s$

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Matter In Our Surroundings

A car travels 270 km in 4.5 hours. Calculate:

(i) its speed;

(ii) how far will it go in 7 hours at this speed; and

(iii) how long will it take to travel 300 km at this speed.

Some More Questions From Matter In Our Surroundings Chapter

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)0⁰C
c)100⁰C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

What produces more severe burns, boiling water or steam ?

8. Name A, B, C, D, E and F in the following diagram showing state change :

Mock Test Series

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Entrance Exams Preparation

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Loaction

For Daily Free Study Material Join wiredfaculty

Matter In Our Surroundings

A car travels 270 km in 4.5 hours. Calculate: (i) its speed; (ii) how far will it go in 7 hours at this speed; and (iii) how long will it take to travel 300 km at this speed.

Some More Questions From Matter In Our Surroundings Chapter

Give reason for the following observations.Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.We can get the smell of perfume sitting several metres away.

What is the physical state of water ata) 25°C b)00Cc)1000C

What is the physical state of water at0°C

What is the physical state of water at100°C

Give two reasons to justifyWater at room temperature is a liquid.

Give two reasons to justifyAn iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

What produces more severe burns, boiling water or steam ?

8. Name A, B, C, D, E and F in the following diagram showing state change :

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

A car travels 270 km in 4.5 hours. Calculate:

(i) its speed;

(ii) how far will it go in 7 hours at this speed; and

(iii) how long will it take to travel 300 km at this speed.

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)0⁰C
c)100⁰C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.