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primary 6 | Maths | Speed
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Xingyao
Xingyao

primary 6 chevron_right Maths chevron_right Speed chevron_right Singapore

I’m confuse

Date Posted: 4 years ago
Views: 273
Ryan Lim
Ryan Lim
4 years ago
8 hours

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Soh
Soh's answer
9 answers (A Helpful Person)
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Hope no careless mistakes.
Phylicia Tong
Phylicia Tong
4 years ago
Answer should be 8hrs.
When car started 2hrs later, lorry already 2x60 =120 km AHEAD.
This means car need to catch up a distance of 120km.

Difference in speed to 75-60 = 15km/hr. This means that car catches up with lorry a distance of 15km every hour.

Therefore 15km in 1 hr.
120km in 120/15 = 8 hrs. (answer)