Can the two speeds simply be averaged for the whole trip?

No. Average speed is total distance divided by total time; the two speeds are held for different times, so a simple average is wrong.

Why multiply by 1000 and divide by 3600 to change km/h into m/s?

1 km is 1 000 m and 1 hour is 3 600 s, so converting both units and dividing gives metres per second.

Primary 6 Maths: Speed — Practice Paper 1 (10 Questions)

2026-10-29

Tutor Prep Guide · Primary Maths

Paper 1 works the speed formula in three directions: speed from distance and time, distance from speed and time, time from distance and speed; then km/h into m/s, decimal hours and clock times, the average speed of a two-leg trip, and the error of writing 30 minutes as 0.3 hour.

Quick answer　Ten questions, about 20 minutes. Items 01 to 03 cover the three forms of the speed formula; items 04 to 06 cover unit conversion, a decimal time and seconds into minutes; items 07 to 09 cover average speed, a clock-time journey and time back from distance; item 10 redoes the 0.3-hour slip.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10 questions
Suggested time	20 minutes
Difficulty mix	Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1
Chapter	Chapter: Primary 6 Maths: Speed — Tutor Lesson Plan
Level	Primary 6

02　Questions (10 items)

FoundationA car covers 120 km in 2 hours. What is its speed?
FoundationA runner moves at 4 m/s for 15 seconds. How far does he go?
FoundationA runner covers 450 m in 90 seconds. What is the speed?
IntermediateA car travels at 90 km/h. How many metres per second is that?
IntermediateA car travels at 80 km/h for 3.5 hours. How far does it go?
IntermediateA 1 500 m path is walked at 1.5 m/s. How long does it take? Give minutes and seconds.
ChallengeA 120 km road is driven out at 60 km/h and back at 40 km/h. What is the average speed for the whole trip?
ChallengeMing leaves at 08:15 and arrives at 09:45, covering 105 km. What is his average speed?
ChallengeA 500 m track is run at 25 m/s. How many seconds does it take?
Error redoMing walks 3 km in 30 minutes. A student answered “10 km/h”. What is the correct speed and what went wrong?

03　Answers and one-line notes

#	Answer	One-line note
1	60 km/h	Speed = distance ÷ time, so 120 ÷ 2 = 60 km/h.
2	60 m	Distance = speed × time, so 4 × 15 = 60 m; seconds match seconds, so no conversion.
3	5 m/s	450 ÷ 90 = 5 m/s.
4	25 m/s	90 km is 90 000 m and 1 hour is 3 600 s, so 90 000 ÷ 3 600 = 25 m/s.
5	280 km	80 × 3.5 = 280 km, and 3.5 hours is 3 hours 30 minutes.
6	1 000 s, which is 16 min 40 s	1 500 ÷ 1.5 = 1 000 s, and 1 000 ÷ 60 = 16 remainder 40.
7	48 km/h	Total distance 240 km over 2 + 3 = 5 hours gives 48 km/h; averaging 60 and 40 to 50 is wrong.
8	70 km/h	From 08:15 to 09:45 is 90 minutes, or 1.5 hours, so 105 ÷ 1.5 = 70 km/h.
9	20 seconds	Time = distance ÷ speed, so 500 ÷ 25 = 20 s.
10	6 km/h; 30 minutes was written as 0.3 hour	30 minutes is 0.5 hour, so 3 ÷ 0.5 = 6 km/h; using 3 ÷ 0.3 gives 10, treating minutes as a decimal.

04　What to do after marking

After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
Repeat the same item two days later; move to the next paper only when both attempts are correct.
Parents only need the answer and note columns; there is no need to explain every item.

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