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primary 6 | Maths
| Fractions
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Date Posted: 3 years ago
Views: 256
120min
can explain? Thks
3 persons take 1 hour to complete.
Let make the house to 180u
If all paint at same speed, each paint 60u in 60 mins (1hr) but this is not.
① When J and M paint take 1h 12min = 72 mins
Therefore, we calculate in 1 hour,
J and M completed = 60÷72×180 = 150u.
So, in 1 hour S completed 180u-150u = 30u
② when M and S paint the house.
They take 1h 30 mins = 90 mins
Therefore, we calculate in 1 hour,
M and S completed = 60÷90×180 = 120u
So, in 1 hour J completed = 180u-120u = 60u
Conclusion in hour, total = 180u
J = 60u
M = 90u
S = 30u
Thus, M alone, take 2 hours (120 mins) to complete 180u.
Let make the house to 180u
If all paint at same speed, each paint 60u in 60 mins (1hr) but this is not.
① When J and M paint take 1h 12min = 72 mins
Therefore, we calculate in 1 hour,
J and M completed = 60÷72×180 = 150u.
So, in 1 hour S completed 180u-150u = 30u
② when M and S paint the house.
They take 1h 30 mins = 90 mins
Therefore, we calculate in 1 hour,
M and S completed = 60÷90×180 = 120u
So, in 1 hour J completed = 180u-120u = 60u
Conclusion in hour, total = 180u
J = 60u
M = 90u
S = 30u
Thus, M alone, take 2 hours (120 mins) to complete 180u.
See 1 Answer
3 persons take 1 hour to complete.
Let make the house to 180u
If all paint at same speed, each paint 60u in 60 mins (1hr) but this is not.
① When J and M paint take 1h 12min = 72 mins
Therefore, we calculate in 1 hour,
J and M completed = 60÷72×180 = 150u.
So, in 1 hour S completed 180u-150u = 30u
② when M and S paint the house.
They take 1h 30 mins = 90 mins
Therefore, we calculate in 1 hour,
M and S completed = 60÷90×180 = 120u
So, in 1 hour J completed = 180u-120u = 60u
Conclusion in hour, total = 180u
J = 60u
M = 90u
S = 30u
Thus, M alone, take 2 hours (120 mins) to complete 180u.
Hope this helps
Let make the house to 180u
If all paint at same speed, each paint 60u in 60 mins (1hr) but this is not.
① When J and M paint take 1h 12min = 72 mins
Therefore, we calculate in 1 hour,
J and M completed = 60÷72×180 = 150u.
So, in 1 hour S completed 180u-150u = 30u
② when M and S paint the house.
They take 1h 30 mins = 90 mins
Therefore, we calculate in 1 hour,
M and S completed = 60÷90×180 = 120u
So, in 1 hour J completed = 180u-120u = 60u
Conclusion in hour, total = 180u
J = 60u
M = 90u
S = 30u
Thus, M alone, take 2 hours (120 mins) to complete 180u.
Hope this helps
Thank you very much
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