Read posting on Sarin’s father visits his friend in JB town to know about JB town as well as reading posting on Sarin’s father crossing the Causeway to know about the Johor-Singapore Causeway.
Read also posting on Sarin learns rate of change in school (Math Concept) to learn about concept of speed and relative speed.
Upper primary school mathematics question UPQ82
Sarin’s father travelled from Simei to JB town by car at an average speed of 60km/h. At the same time there was a taxi started off together in the same direction from Simei and drove towards JB Town at an average speed of 96km/n. How far apart would they be after 20 minutes?
Solution:
The speed of Taxi is faster than Car by 96 – 60 = 36km/h
Another word, the taxi would travel 36km more than the car in one hour time.
20minutes is 20/60 = 1/3 of an hour
We can draw a distance as below:
3 units = 36
1 unit (20minutes) = 12km
The taxi and the car are 12km apart after 20mintues
Solving Primary School Mathematics 