A person walks 3 km at a speed of 4 km/h and then runs 2 km at a speed of 8 km/h

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Question: A person walks 3 km at a speed of 4 km/h and then runs 2 km at a speed of 8 km/h. What is the total time taken? (2020)

Options:

Correct Answer: 1.25 hours

Exam Year: 2020

Solution:

Time walking = 3 km / 4 km/h = 0.75 hours; Time running = 2 km / 8 km/h = 0.25 hours. Total time = 0.75 + 0.25 = 1 hour.

A person walks 3 km at a speed of 4 km/h and then runs 2 km at a speed of 8 km/h. What is the total time taken? (2020)

A person walks 3 km at a speed of 4 km/h and then runs 2 km at a speed of 8 km/h. What is the total time taken? (2020)

Step 1: Identify the distance walked, which is 3 km.
Step 2: Identify the speed while walking, which is 4 km/h.
Step 3: Calculate the time taken to walk using the formula: Time = Distance / Speed. So, Time walking = 3 km / 4 km/h.
Step 4: Perform the calculation for walking: 3 divided by 4 equals 0.75 hours.
Step 5: Identify the distance run, which is 2 km.
Step 6: Identify the speed while running, which is 8 km/h.
Step 7: Calculate the time taken to run using the same formula: Time = Distance / Speed. So, Time running = 2 km / 8 km/h.
Step 8: Perform the calculation for running: 2 divided by 8 equals 0.25 hours.
Step 9: Add the time taken for walking and running to find the total time: Total time = 0.75 hours + 0.25 hours.
Step 10: Perform the addition: 0.75 plus 0.25 equals 1 hour.

Speed, Distance, and Time – Understanding the relationship between speed, distance, and time, and how to calculate time taken for different segments of a journey.