Lesson eLearning

A child hears a drum 3 seconds after the drum is struck. If the speed of sound is 340 m/s, how far was the drum from the child?

medium 2 marks Class 4 · EVS · Ear to Ear
Answer
1020 metres

The correct answer is 1020 metres — Therefore the drum was 1020 metres away.

Step-by-step solution

  1. Use the formula distance = speed × time.
  2. Speed of sound = 340 m/s.
  3. Time lag = 3 s.
  4. Distance = 340 × 3 = 1020 metres.
  5. Therefore the drum was 1020 metres away.
Common mistake: Multiplying instead of dividing

Concept tested: Distance calculation with sound speed

Published · How this solution was prepared and checked

← All Ear to Ear questions