All Exams Test series for 1 year @ ₹349 only
Question

A person takes one hour more to cover a certain distance walking at a speed of 2 km/hour compared to walking at 3 km/hour. The distance is

The correct answer is

6 km

Let's figure out the distance the person traveled using the information about their speeds and the difference in time taken.

Distance, Speed, and Time

The relationship between distance, speed, and time is a fundamental concept in motion problems. It is given by the formula:

\( \text{Distance} = \text{Speed} \times \text{Time} \)

From this formula, we can also express time as:

\( \text{Time} = \frac{\text{Distance}}{\text{Speed}} \)

Setting Up the Problem Variables

Let the unknown distance be \(d\) kilometers.

We are given two different speeds at which the person walks:

  • Speed 1 (\(S_1\)) = 2 km/hour
  • Speed 2 (\(S_2\)) = 3 km/hour

Let \(T_1\) be the time taken to cover the distance \(d\) at Speed 1, and \(T_2\) be the time taken to cover the same distance \(d\) at Speed 2.

Calculating Time Taken at Each Speed

Using the formula \( \text{Time} = \frac{\text{Distance}}{\text{Speed}} \), we can write the time taken for each speed:

  • Time taken at 2 km/hour: \( T_1 = \frac{d}{2} \) hours
  • Time taken at 3 km/hour: \( T_2 = \frac{d}{3} \) hours

Using the Time Difference Information

The problem states that the person takes one hour more to cover the distance walking at 2 km/hour compared to walking at 3 km/hour. This means the difference between the two times is 1 hour.

So, we can write the equation:

\( T_1 - T_2 = 1 \)

Substitute the expressions for \(T_1\) and \(T_2\) we found earlier:

\( \frac{d}{2} - \frac{d}{3} = 1 \)

Solving for the Distance \(d\)

Now, we need to solve this equation to find the value of \(d\).

To subtract the fractions on the left side, we need a common denominator. The least common multiple of 2 and 3 is 6.

Multiply the first term by \( \frac{3}{3} \) and the second term by \( \frac{2}{2} \):

\( \frac{d}{2} \times \frac{3}{3} - \frac{d}{3} \times \frac{2}{2} = 1 \)

\( \frac{3d}{6} - \frac{2d}{6} = 1 \)

Combine the fractions on the left side:

\( \frac{3d - 2d}{6} = 1 \)

\( \frac{d}{6} = 1 \)

To isolate \(d\), multiply both sides of the equation by 6:

\( d = 1 \times 6 \)

\( d = 6 \)

Final Distance

The distance covered is 6 kilometers.

Was this answer helpful?

Important Questions from Speed Time and Distance

  1. A journey of 900 km is completed in 11 h. If two-fifth of the journey is completed at the speed of 60 km/h, at what speed (in km/h) is the remaining journey completed?

  2. A car starts from point A towards point B, travelling at the speed of 20 km/h. 1 \(\frac{1}{2}\) hours later, another car starts from point A and travelling at the speed of 30 km/h and reaches 2 \(\frac{1}{2}\) hours before the first car. Find the distance between A and B.

  3. A bus covered a distance of 162 km. If speed of this bus is 15 m/s, then what will be the time taken ?

  4. An athlete runs an 800 m race in 96 seconds. His speed (in km / h) is:

  5. A person has to cover a distance of 150 km in 15 hours. If he traveled with the speed of 11.8 km/hr for 10 hours. At what speed he has to travel to cover the remaining distance in the remaining time?

Need Expert Advice?

Start Your Preparation with Prepp Mobile App

Download the app from Google Play & App Store
Download the app from Google Play & App Store
Prepp Mobile App