1. Ravi and Sathish started for school at 8.00 a.m. from their houses which are side by side. Ravi started on a bicycle and Sathish by walk.
Who will reach the school first? How much earlier will he be compared to the other?
How do you measure ‘early’ or ‘late’ arrival at school?
2. You can easily estimate that Ravi reaches the school earlier than Sathish.
3. But to answer the question of how early Ravi reached, we need to measure the times taken by both Ravi and Sathish and find the difference of time between both the cases.
4. For this we need time measuring instruments like watches, clocks etc.
5. Nowadays, we use different instruments like electronic clocks, digital clocks, quartz clocks etc. to measure time.
6. A few decades ago people used pendulum clocks that have now become rare.
