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Question
primary 6 | Maths
| Speed
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We need to find the average speed of Jerry
Date Posted: 4 years ago
Views: 264
For 5 hours, their combined distance is 1200km.
So their combined distance in 1 hour
= 1200km ÷ 5 = 240km
Now, Tom is 20km/h slower.
So in 1 hour, he will travel 20km less than Jerry.
From 240km, add 20km to make their distance the same.
20km + 240km = 260km
Now this 260km is twice of Jerry's distance in 1 hour.
Jerry's distance in 1 hour
= 260km ÷ 2 = 130km
So his speed is 130km/h since he travelled 130km in 1 hour.
So their combined distance in 1 hour
= 1200km ÷ 5 = 240km
Now, Tom is 20km/h slower.
So in 1 hour, he will travel 20km less than Jerry.
From 240km, add 20km to make their distance the same.
20km + 240km = 260km
Now this 260km is twice of Jerry's distance in 1 hour.
Jerry's distance in 1 hour
= 260km ÷ 2 = 130km
So his speed is 130km/h since he travelled 130km in 1 hour.
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Hope this helps
Date Posted:
4 years ago
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