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Question

A cyclist travels at 18 km/hr for 2.5 hours. What distance does he cover?

The correct answer is
45 km

Calculating Distance Covered by a Cyclist

This problem asks us to find the total distance a cyclist travels given their speed and the duration of their travel.

Understanding the Concepts

To solve this, we need the fundamental relationship between distance, speed, and time. The formula is:

Distance = Speed × Time

In mathematical notation, this is represented as:

\( d = v \times t \)

Where:

  • \( d \) represents the distance traveled.
  • \( v \) represents the speed of the object.
  • \( t \) represents the time taken.

Applying the Formula

We are given the following information:

  • Speed (\( v \)) = 18 km/hr
  • Time (\( t \)) = 2.5 hours

Now, we substitute these values into the formula:

\( d = 18 \text{ km/hr} \times 2.5 \text{ hours} \)

Step-by-Step Calculation

  1. Identify the given values:
    • Speed = 18 km/hr
    • Time = 2.5 hours
  2. Recall the formula: Distance = Speed × Time.
  3. Substitute the values into the formula:

    Distance = \( 18 \times 2.5 \) km

  4. Perform the multiplication:

    \( 18 \times 2.5 = 45 \)

    You can calculate this as \( 18 \times \frac{5}{2} \), which simplifies to \( 9 \times 5 \), resulting in 45.

  5. State the final answer with units: The distance covered is 45 km.

Conclusion

By applying the distance formula using the provided speed and time, the cyclist covers a distance of 45 km.

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Important Questions from Speed Time & Distance (Notes)

  1. Ajay walks at a speed of 4 km/hr. He doubles his speed after reaching exactly half way. He walks for 12 hours in all. What is the total distance travelled by him ?
  2. With a certain set of diameters, a tractor's front wheels make 2 revolutions (revs) for every 1 revolution of the rear wheels. The effect of changing wheel diameter(s) is shown in the following plot. 

     In this context, which of the following statements is CORRECT?

  3. A train travels from Karnal to Kurukshetra at a speed of $90$ km/hr and returns at a speed of $92$ km/hr. If it takes $182$ hours for total travel, then find the distance between Karnal to Kurukshetra. (In Km)
  4. A car covers 4 successive stretches of 3 km each at speed of 10 kmph, 20 kmph, 30 kmph and 60 kmph respectively. The average speed of the car for the entire journey is:

  5. A car covers a distance from Hayathnagar to LB nagar at the speed of 64 km/hr and covers the distance from LB nagar to Hayathnagar at the speed of 56 km/hr. What is the average speed (rounded off to nearest integer) of the car?
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