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secondary 2 | Maths
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Angela
Angela

secondary 2 chevron_right Maths chevron_right Singapore

help me qn b

Date Posted: 1 month ago
Views: 15
J
J
1 month ago
Since you know 36 cars can be washed in 1 hr,

So for 12 cars, it's 12/36 of that.
12/36 =⅓

So for 12 cars it will take ⅓ of an 1 hr , which is 20 min

Or

Time taken
= 12/36 x 1 h
= 1/3 x 1h
= 1/3 h
= 20/60 h

= 20 min

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Roy
Roy's answer
2 answers (Tutor Details)
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Hope this helps.