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A can finish a race in 100 seconds, while B can finish it in 120 seconds. If the

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Question: A can finish a race in 100 seconds, while B can finish it in 120 seconds. If they start together, how much time will A be ahead of B when they finish the race?

Options:

  1. 20 seconds
  2. 15 seconds
  3. 10 seconds
  4. 5 seconds

Correct Answer: 20 seconds

Solution: 

A\'s speed = 1/100, B\'s speed = 1/120. Time taken by A to finish = 100 seconds, B takes 120 seconds. A is ahead by 120 - 100 = 20 seconds.

A can finish a race in 100 seconds, while B can finish it in 120 seconds. If the

Practice Questions

Q1
A can finish a race in 100 seconds, while B can finish it in 120 seconds. If they start together, how much time will A be ahead of B when they finish the race?
  1. 20 seconds
  2. 15 seconds
  3. 10 seconds
  4. 5 seconds

Questions & Step-by-Step Solutions

A can finish a race in 100 seconds, while B can finish it in 120 seconds. If they start together, how much time will A be ahead of B when they finish the race?
  • Step 1: Understand that A finishes the race in 100 seconds and B finishes it in 120 seconds.
  • Step 2: Calculate the time difference between A and B when A finishes the race.
  • Step 3: Since A finishes in 100 seconds and B finishes in 120 seconds, subtract A's time from B's time: 120 seconds - 100 seconds.
  • Step 4: The result is 20 seconds, which means A is ahead of B by 20 seconds when A finishes the race.
  • Speed and Time Calculation – Understanding the relationship between speed, time, and distance to determine how much faster one competitor is than another.
  • Difference in Finishing Times – Calculating the difference in finishing times to find out how much ahead one competitor is compared to another.
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