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Grade 7 Video Lessons on Measurement: Time, Distance and Speed
Convert the following to kilometres per hour.
a) 75 m/s
b) 31.25 m/s
(7m 38s)
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1.
Four learners participated in races and the time each took was recorded as shown below. Calculate their speeds in metres per second. a) 150 m in 25 seconds b) 1 500 m in 2 minutes 30 seconds
2.
A teacher walked from the staffroom to a class, 150 m away. She took 1 minute 15 seconds. At what speed did the teacher walk?
3.
Awino transported her goods from the farm to the market, 36 km away using a motorbike. She arrived at the market in 45 minutes. At what speed did she ride the motorbike? Express your answer in metres per second.
4.
Convert the following to seconds. a) 29 minutes b) 3 hours 17 minutes c) 11 hours 31 minutes
5.
How many hours are in the following seconds? a) 3 600 seconds b) 20 160 seconds
6.
To store water for future use, a school bought a tank. To fill the tank with water, a tap took 12 360 seconds. How many hours did the tap take to fill the tank?
7.
Convert the following to kilometres. a) 4 800 m b) 6 612 m
8.
Convert the following to metres. a) 13.02 km b) 3 km
9.
Nekesa and Kimeu are mountain climbers. One day, they climbed up to the peak of Mt Kenya, 5 199 m above sea level. How high were they above sea level in kilometres?
10.
In a certain year, the President of Kenya travelled to Uganda by air to chair the East Africa Community meeting in Kampala. The distance from Nairobi to Kampala by air is 505 km. The plane took 1 hour 10 minutes. What was the speed of the plane in kilometres per hour?
11.
Fishing is one of the main economic activities in the lake regions of Kenya. A fisherman used a boat to cross a lake 5 km wide. The fisherman took 1 hour 45 minutes to cross the lake. What was the speed of the boat in kilometres per hour?
12.
The Wildlife Club members from Nidhamu Junior Secondary School used a bus to travel to Shimba Hills National Reserve, 120 km away. The journey took 3 hours. Calculate the speed of the bus in kilometres per hour.
13.
Kahiu used a motorcycle to supply fertilizer to a group of farmers from a certain town. The distance from the farms to the town is 51 km and it took him 45 minutes to travel. At what speed, in kilometres per hour, did he ride the motorbike?
14.
Convert the following to metres per second: a) 36 km/h b) 144 km/h
15.
Awuor was driving her car at a speed of 100 km/h. She saw a signboard showing the speed limit as 90 km/h. She reduced the speed of her car to the speed limit. What was the speed limit in metres per second?
16.
The distance from Nairobi to Kisumu is 360 km. A bus took 5 h to travel from Nairobi to Kisumu. a) Calculate the speed of the bus in kilometres per hour. b) Convert the speed of the bus to metres per second.
17.
Kagwanja drove his car for 30 km to deliver books to a children’s home. He took 30 minutes to reach the children’s home. a) Calculate his speed in kilometres per hour. b) Convert the speed to metres per second.
18.
Convert the following to kilometres per hour. a) 75 m/s b) 31.25 m/s
19.
To determine the flying speed of a bird, Njukia scared a bird that had perched on a certain tree. He timed it as it flew from the tree to another and found that it took 6 seconds. The distance between the two trees was 144 m. a) Calculate the speed of the bird in metres per second. b) Convert the speed in metres per second to kilometres per hour.
20.
In the Olympics competitions, an athlete completed the 400 m race in two-thirds of a minute. a) At what speed in metres per second did the athlete run? b) Convert the speed in metres per second to kilometres per hour.
21.
Amina’s car consumes one litre of petrol to cover 12 km. One day, she drove the car for 40 minutes and consumed 5 l of petrol. a) At what speed in metres per second did she drive? b) Convert the speed in metres per second to kilometres per hour.
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