A man is walking at a speed of 3.5 kmph. Find the distance covered by him in 15 minutes.

Appeared in: RRB Staff Nurse Kolkata-2015

Explanation

The core task is to calculate distance using the formula: Distance = Speed × Time.
First, ensure units are consistent. The speed is in km/hour and time is in minutes. Convert 15 minutes to hours: 15 / 60 = 0.25 hours.
Calculate the distance in kilometers: 3.5 km/hour × 0.25 hours = 0.875 km.
Finally, convert the distance from kilometers to meters, as required by the options: 0.875 km × 1000 m/km = 875 meters.

Option B: This result might be obtained from an incorrect calculation, possibly by misinterpreting the conversion between hours and minutes.
Option C: This value is close to the correct answer but is incorrect. It may result from a rounding error or a slight miscalculation during the multiplication step (e.g., incorrectly multiplying 3.5 by 0.25).
Option D: This result is incorrect and likely stems from a calculation error, such as incorrectly converting units or multiplying the given numbers.

Visual 1: Infographic: A simple visual triangle diagram showing the relationship between Distance, Speed, and Time (D on top, S and T at the bottom). This helps visualize how to rearrange the formula (D = S × T, S = D / T, T = D / S).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculation of Distance from Speed and Time as background academic context rather than a clinical decision trigger.
This question tests basic numerical ability and aptitude, a skill required for various calculations in nursing, such as drug dosage and IV drip rate calculations.
While not a direct clinical scenario, the logical process of checking units, converting, and applying a formula is a foundational skill for ensuring patient safety in medication administration.
What if the time was 30 minutes? The distance would be double. Time = 0.5 hours, so Distance = 3.5 km/hr * 0.5 hr = 1.75 km, or 1750 meters.

How to Approach the Question

First, identify the given values: Speed = 3.5 kmph and Time = 15 minutes.
Notice the inconsistency in units (hours vs. minutes). Decide on a consistent unit. Converting minutes to hours is a good first step.
Convert the time: 15 minutes ÷ 60 = 0.25 hours.
Recall the formula for distance: Distance = Speed × Time.
Substitute the values into the formula: Distance = 3.5 × 0.25.
Calculate the result (0.875 km) and then check the units required by the answer options (meters). Convert your result accordingly (0.875 km × 1000 = 875 m).

Concept Tested & Keywords

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