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प्रश्न
Mohit can complete a work in 50 days, whereas Anuj can complete the same work in 40 days. Find:
(i) work done by Mohit in 20 days.
(ii) work left after Mohit has worked on it for 20 days.
(iii) time taken by Anuj to complete the remaining work.
उत्तर
Mohit can complete a work in 50 days
and Anuj can complete the same work in 40 days
∴ Mohit's one day's work = `1/50`
and Anuj's one day's work =`1/40`
(i) Mohit's 20 day's work = `1/50 xx 20 = 2/5`
(ii) Work left = `1 - 2/5 = (5 - 2)/5 = 3/5`
Anuj can do `3/5` work in = `40xx3/5` days = 24 days
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| i | 35 Km/hour | 280 Km | |
| ii | 40 Km/hour | 360 Km | |
| iii | 45 Km/hour | 315 Km | |
| iv | 50 Km/hour | 300 Km | |
| v | 55 Km/hour | 275 Km |
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These log boats do not go very far. If the wind is helpful, then travel about 4 km in one hour.
How long will they take to go a distance of 10 km?
In one trip the logboat brings about 20 kg of fish. But other types of boats bring a bigger catch as given in the table. The table also shows the speed of each type of boat, which is how far each boat goes in one hour. Look at the table and calculate -
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| Type of boat | Catch of fish in one trip (in kg) |
Speed of the boat (how far it goes in one hour) |
| Log boat | 20 | 4 km per hour |
| Long tail boat | 600 | 12 km per hour |
| Motorboat | 800 | 20 km per hour |
| Machine boat | 6000 | 22 km per hour |
