Question : A civil contractor planned to build an over bridge of 3 km distance in 600 days. For this purpose, he employed 90 workers. After 200 days of work, it was observed that only 0.5 km of the bridge was completed. What is the number of extra workers required to complete the work on time?
Option 1: 100
Option 2: 140
Option 3: 125
Option 4: 135
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Correct Answer: 135
Solution : $\frac{M1D1}{W1}$ = $\frac{M2D2}{W2}$ [where $M$ = number of men, $D$ = number of days, $W$ = work done] ⇒ $\frac{90×200}{0.5}$ = $\frac{M×400}{2.5}$ ⇒ M = 90 × 2.5 = 225 So, the extra men to be employed = 225 – 90 = 135 Hence, the correct answer is 135.
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Question : A company employed 200 workers to complete a certain task in 150 days. If only one-fourth of the work has been done in 50 days. Then, in order to complete the whole work on time, the number of additional workers to be employed was:
Option 2: 300
Option 3: 600
Option 4: 200
Question : A contractor decided to complete a work in 80 days and employed 60 men at the beginning and 20 men additionally after 20 days and got the work completed as per schedule. If he had not employed the additional men, how many extra days would he have needed to complete the work (round off to the nearest integer)?
Option 1: 32 days
Option 2: 20 days
Option 3: 30 days
Option 4: 26 days
Question : 14 persons can build a house in 60 days. How long will it take 30 people to build your house, provided that they all work at the same rate?
Option 1: 28 days
Option 2: 30 days
Option 3: 32 days
Option 4: 56 days
Question : Vikas covered a certain distance by bike. If he covers 40% of the distance at 40 km/hr, 50% of the distance at 25 km/hr and the remaining 10% distance at 10 km/hr. Find his average speed over the whole distance.
Option 1: 25 km/hr
Option 2: 28 km/hr
Option 3: 26 km/hr
Option 4: 30 km/hr
Question : Direction: A man takes 6 kms distance to go around the rectangular area. If the area of the rectangle is 2 sq. km. Find the difference between length and breadth.
Option 1: 2 km
Option 2: 0.5 km
Option 3: 1 km
Option 4: 0.75 km
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