Mathematics · Time and Work
The traffic lights at three different road crossings change after every 30 seconds, 40 seconds, and 60 seconds respectively. If they change simultaneously at a certain time, how many times will they change simultaneously during a period of 30 minutes (excluding the initial simultaneous change)?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
Share:
- 115✓
- 213
- 318
- 419
Correct answer
15
Download Single Question PDF
Save this question and verified answer as a clean study sheet with live clickable link.
👥
Share with Friends & Study Groups
Challenge your peer aspirants on WhatsApp or Telegram to solve this question!
Online Test Series
Start Free Mock Test →Preparing for Mathematics?
Practice full-length mock tests with real exam timers, instant score analysis, and all-India ranking.
Chapter Practice
Practice Time and Work MCQs →Want more practice questions on Time and Work?
Solve complete topic-wise tests with detailed solutions on GkGet.
Related Practice Questions
Recommended practice questions in Mathematics · Time and Work