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primary 6 | Maths
| Speed
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Speed question
Date Posted: 4 years ago
Views: 515
1110 - 1040 →1070 - 1040 = 0030
→ ½ hour
When Danny started his journey, Jack had already been travelling for ½ hour.
½ hour x 80km/hour = 40km
So Jack had already travelled 40km when Danny started.
880km - 40km = 840km
The distance between them at 1110 hours was 840km.
In 1 hour, their distance travelled combined = 80km + 60km = 140km
840km ÷ 140km = 6
So they will take 6 hours to cover a total of 840km, where they will meet each other.
6 hours → 0600
1110 + 0600 = 1710
They will meet each other at 1710
→ ½ hour
When Danny started his journey, Jack had already been travelling for ½ hour.
½ hour x 80km/hour = 40km
So Jack had already travelled 40km when Danny started.
880km - 40km = 840km
The distance between them at 1110 hours was 840km.
In 1 hour, their distance travelled combined = 80km + 60km = 140km
840km ÷ 140km = 6
So they will take 6 hours to cover a total of 840km, where they will meet each other.
6 hours → 0600
1110 + 0600 = 1710
They will meet each other at 1710
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Date Posted:
4 years ago
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