This blog is managed by Song Hock Chye, author of Improve Your Thinking Skills in Maths (P1-P3 series), which is published and distributed by EPH.

## Wednesday, July 09, 2008

### S’pore Hokkien Huay Kuan 2007 PSLE Math Prelim Q46

At 8.30 am. Tom drove from Town P to Town Q at an average speed of 80 km/h. After driving 2/5 of the journey for 4 hours, he passed Paul who was travelling along the same road in the opposite direction. Paul was travelling at a speed which was 20 km/h slower than Tom. At what time did Paul leave Town Q?

Solution

2 units ----- 320 km
1 unit ----- 320 km divided by 2 = 160 km

Distance Paul covered when he passed Tom
3 units ----- 160 km x 3 = 480 km

Time Paul took to cover 480 km -----
480 km divided by 60 km/h = 8 hours

8 hours before 12.30 pm is 4.30 am.

Answer: Paul left Town Q at 4.30 am.

Note – “The Singapore Hokkien Huay Kuan 5-School Combined Prelim Maths” is the common Maths Prelim Exam for Tao Nan, Ai Tong, Chongfu, Nan Chiau and Kong Hwa schools.