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A bus travels 120 km at a speed of 60 km/h and returns at a speed of 40 km/h. Wh

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Question: A bus travels 120 km at a speed of 60 km/h and returns at a speed of 40 km/h. What is the average speed for the entire trip? (2023)

Options:

  1. 48 km/h
  2. 50 km/h
  3. 52 km/h
  4. 54 km/h

Correct Answer: 48 km/h

Exam Year: 2023

Solution: 

Time for first part = 120/60 = 2 hours. Time for return = 120/40 = 3 hours. Total time = 2 + 3 = 5 hours. Average speed = Total distance / Total time = 240 km / 5 hours = 48 km/h.

A bus travels 120 km at a speed of 60 km/h and returns at a speed of 40 km/h. Wh

Practice Questions

Q1
A bus travels 120 km at a speed of 60 km/h and returns at a speed of 40 km/h. What is the average speed for the entire trip? (2023)
  1. 48 km/h
  2. 50 km/h
  3. 52 km/h
  4. 54 km/h

Questions & Step-by-Step Solutions

A bus travels 120 km at a speed of 60 km/h and returns at a speed of 40 km/h. What is the average speed for the entire trip? (2023)
  • Step 1: Calculate the time taken for the first part of the trip. The bus travels 120 km at a speed of 60 km/h. Use the formula: Time = Distance / Speed. So, Time = 120 km / 60 km/h = 2 hours.
  • Step 2: Calculate the time taken for the return trip. The bus travels the same distance of 120 km at a speed of 40 km/h. Use the same formula: Time = Distance / Speed. So, Time = 120 km / 40 km/h = 3 hours.
  • Step 3: Add the time taken for both parts of the trip to find the total time. Total time = Time for first part + Time for return = 2 hours + 3 hours = 5 hours.
  • Step 4: Calculate the total distance traveled. The bus travels 120 km to the destination and 120 km back. Total distance = 120 km + 120 km = 240 km.
  • Step 5: Calculate the average speed for the entire trip. Use the formula: Average Speed = Total Distance / Total Time. So, Average Speed = 240 km / 5 hours = 48 km/h.
  • Average Speed Calculation – The average speed is calculated by dividing the total distance traveled by the total time taken for the trip.
  • Time Calculation – Understanding how to calculate time based on distance and speed is crucial for solving the problem.
  • Round Trip Consideration – Recognizing that the trip consists of two parts with different speeds is essential for accurate calculations.
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