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Question

Priyanka covers 800 m distance in 6 minutes. Her speed in km/hr is:

The correct answer is
8 km/hr

Calculate Speed in km/hr

This solution explains how to calculate Priyanka's speed in kilometers per hour (km/hr) based on the distance she covers and the time taken. We will break down the problem into simple steps.

Understanding the Given Information

We are given the following details:

  • Distance covered by Priyanka: 800 m
  • Time taken: 6 minutes

The goal is to find the speed in km/hr.

Step-by-Step Conversion and Calculation

To find the speed in km/hr, we first need to convert the given distance from meters (m) to kilometers (km) and the time from minutes to hours (hr).

1. Convert Distance from Meters (m) to Kilometers (km)

We know that 1 kilometer is equal to 1000 meters. To convert meters to kilometers, we divide the distance in meters by 1000.

Distance in km = $\frac{\text{Distance in m}}{1000}$

Distance in km = $\frac{800}{1000}$ km

Distance in km = 0.8 km

2. Convert Time from Minutes to Hours (hr)

We know that 1 hour is equal to 60 minutes. To convert minutes to hours, we divide the time in minutes by 60.

Time in hr = $\frac{\text{Time in minutes}}{60}$

Time in hr = $\frac{6}{60}$ hr

Time in hr = $\frac{1}{10}$ hr = 0.1 hr

3. Calculate Speed in km/hr

The formula for speed is:

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

Now, we can substitute the converted values into the formula:

Speed = $\frac{0.8 \text{ km}}{0.1 \text{ hr}}$

Speed = 8 km/hr

Final Answer Verification

After converting the distance to kilometers and the time to hours, we calculated the speed using the standard formula. The result shows that Priyanka's speed is 8 km/hr.

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