Page 115 - NUMINO Challenge_C2
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13 Distance and Speed
Basic Concepts Time Taken for Two people to Meet
The time taken for two people walking in opposite directions to meet is:
(Distance between the two people) (Sum of speeds)
Distance between 2 people
Distance between 2 people
The time taken for two people walking in the same direction to meet is:
(Distance that needs to be caught up) (Difference between speeds)
Distance to catch up
Distance to catch up
Example Grace and Becky lef t their homes at the same time and met 10
minutes later. If Grace walked 50 m in one minute and Becky
walked 40 m in one minute, what is the distance between Grace’s
and Becky ’s house?
Grace's house Becky's house
Class Notes
In one minute, Grace walked 50 m in one minute and Becky walked 40 m towards each
other. Therefore, the distance between the two people decreased by m every
minute.
The distance between the two houses is equal to the distance decreased in 10 minutes.
Therefore, the distance between the two houses is 10 m.
112 NUMINO Challenge C2
Basic Concepts Time Taken for Two people to Meet
The time taken for two people walking in opposite directions to meet is:
(Distance between the two people) (Sum of speeds)
Distance between 2 people
Distance between 2 people
The time taken for two people walking in the same direction to meet is:
(Distance that needs to be caught up) (Difference between speeds)
Distance to catch up
Distance to catch up
Example Grace and Becky lef t their homes at the same time and met 10
minutes later. If Grace walked 50 m in one minute and Becky
walked 40 m in one minute, what is the distance between Grace’s
and Becky ’s house?
Grace's house Becky's house
Class Notes
In one minute, Grace walked 50 m in one minute and Becky walked 40 m towards each
other. Therefore, the distance between the two people decreased by m every
minute.
The distance between the two houses is equal to the distance decreased in 10 minutes.
Therefore, the distance between the two houses is 10 m.
112 NUMINO Challenge C2
