3.5 Time, Distance, and Speed

• Units of measuring time: seconds, minutes, hours, days, weeks, months, years
• Conversions in units of time
• Conversions in units of distance: mm, cm, m, km
• Speed as distance covered per unit time
• Working out speed in kilometres per hour (km/h)
• Working out speed in metres per second (m/s)
• Converting km/h to m/s and m/s to km/h
• Road signs, speed limiters and road safety in Kenya

• identify units of measuring time in real-life situations
• convert units of time from one form to another in learning situations
• convert units of measuring distance in learning situations
• identify speed as distance covered per unit time in different situations
• work out speed in km/h and m/s in real-life situations
• convert units of speed from kilometres per hour (km/h) to metres per second (m/s) and vice versa in real-life situations
• reflect on the use of time, distance and speed in real-life situations

“Why do we relate distance, time and speed?”

“What is the importance of speed in daily activities?”

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1. Units of time
   40 min · 1 practice tasks · quiz
   Identify seconds, minutes, hours, days, weeks and years on analogue and digital clocks, including a 40-minute lesson and school punctuality.
2. Converting units of time
   40 min · 1 practice tasks · quiz
   Convert among hours, minutes and seconds using ×60 and ÷60, including mixed times such as 2 h 30 min.
3. Converting units of distance
   40 min · 1 practice tasks · quiz
   Convert kilometres, metres and centimetres, estimate a local journey, and put both ends of a trip in one unit.
4. Speed as distance per unit time
   40 min · 1 practice tasks · quiz
   Identify speed as distance covered per unit time, matching km with hours or metres with seconds.
5. Speed in kilometres per hour
   40 min · 1 practice tasks · quiz
   Work out speed in km/h for matatus, walks and trains, converting minutes to hours first.
6. Speed in metres per second
   40 min · 1 practice tasks · quiz
   Work out speed in m/s for sprints, laps and timed walks, converting minutes to seconds first.
7. Converting km/h and m/s
   40 min · 1 practice tasks · quiz
   Convert kilometres per hour to metres per second using × 5/18, and the reverse using × 18/5.
8. Road signs, speed limiters and safety
   40 min · 1 practice tasks · quiz
   Read Kenyan speed-limit signs, explain PSV speed limiters often set at 80 km/h, and connect speed to road safety and patriotism.