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secondary 4 | A Maths
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Help Dennia marcella denis! Anyone can contribute an answer, even non-tutors.
Can u help me answer this question step by step?
Date Posted: 5 years ago
Views: 189
Two ways.
First way:
① Abu and Ben cross first.
Time taken : 2 min (Ben's speed)
② Ben comes back alone.
Time taken : 2 min
③ Chan and Dass cross.
Time taken : 10 min (Dass's speed)
④ Abu , who was on the other side, comes back.
Time taken : 1 min
⑤ Abu and Ben cross.
Time taken : 2 min (Ben's speed)
Total time taken
= 2 min + 2 min + 10 min + 1 min + 2 min
= 17 min
First way:
① Abu and Ben cross first.
Time taken : 2 min (Ben's speed)
② Ben comes back alone.
Time taken : 2 min
③ Chan and Dass cross.
Time taken : 10 min (Dass's speed)
④ Abu , who was on the other side, comes back.
Time taken : 1 min
⑤ Abu and Ben cross.
Time taken : 2 min (Ben's speed)
Total time taken
= 2 min + 2 min + 10 min + 1 min + 2 min
= 17 min
Second way:
① Abu and Ben cross first.
Time taken : 2 min (Ben's speed)
② Abu comes back alone.
Time taken : 1 min
③ Chan and Dass cross.
Time taken : 10 min (Dass's speed)
④ Ben , who was on the other side, comes back.
Time taken : 2 min
⑤ Abu and Ben cross.
Time taken : 2 min (Ben's speed)
Total time taken
= 2 min + 1 min + 10 min + 2 min + 2 min
= 17 min
① Abu and Ben cross first.
Time taken : 2 min (Ben's speed)
② Abu comes back alone.
Time taken : 1 min
③ Chan and Dass cross.
Time taken : 10 min (Dass's speed)
④ Ben , who was on the other side, comes back.
Time taken : 2 min
⑤ Abu and Ben cross.
Time taken : 2 min (Ben's speed)
Total time taken
= 2 min + 1 min + 10 min + 2 min + 2 min
= 17 min
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