Question
Aman, Sam and Kiran started working together but after 8
days Kiran left the job and 5 days before the completion of the work Sam also left then, In how many days the whole work gets completed? Suppose five friends Ritu, Mohani, Aman, Sam and Kiran are appoints to complete a certain piece of work. Ram and Mohani together can complete a work in 24 days. Mohani and Aman together can complete 50% of the work in 15 days. Aman and Sam together can complete the work in 24 days. Ritu and Kiran together can complete 16.66% of the work in 6 days. Sam and Kiran together can complete the work in 20 days.Solution
ATQ, we can say that Efficiency of, Ram = r, Mohani = m, Aman = a, Sam = s, Kiran = k (r + m) × 24 = (m + a) × 30 = (a + s) × 24 = (r + k) × 36 = (s + e) × 20 = 360 r + m = 15, m + a = 12, a + s = 15, r + k = 10, s + k = 18 (m + a) + (a + d) – (r + m) – (s + k) + (r + k) = 12 + 15 – 15 – 18 + 10 2a = 4 a = 2, m = 10, r = 5, s = 13, k = 5. ATQ, Let work will be completed in w days 2 × w + 13 × (w – 5) + 5 × 8 = 360 2w + 13x – 65 + 40 = 360 15w = 360 + 25 = 385 w = 77/3 days
A train travelling with a speed of 36 km/h can cross a pole in 9 seconds. Find the time taken by the train to cross a 180 metres long platform if the sp...
A train crosses a pole and a platform of length 624 metres in 13 seconds and 29 seconds, respectively. Find the length of train.
Two trains of equal lengths take 30 seconds and 45 seconds respectively to cross a telegraph post. If the length of each train be 450 metres, in what ti...
A man running at the speed of 6 kmph was over taken by the train moving with the speed of 78 kmph in 23 seconds. Find the length of train.
- A train takes 22 seconds to pass a tunnel of length 500 m and also overtakes a cyclist riding at 8 m/s in the opposite direction in 7 seconds. Determine th...
Train ‘A’ running with a speed of 108 km/hr crosses a vertical pole in 13 seconds. Find the approx. time taken by the train ‘A’ ...
A train travelling at the speed of 72 km/hr crosses another train, having 60 meters less length and travelling in opposite direction at the speed of 54 ...
A train can cross a pole, a bridge of 510 meter long and platform of 480 meter long in 15 seconds, _____ seconds and 31 seconds, respectively.
Th...
- Two stations P and Q are 486 km apart. A train leaves P at 6:45 a.m. at 54 km/h. Another train leaves Q at 8:15 a.m. towards P at 81 km/h. When will they m...
Two trains 160 metres and 140 metres in length are running towards each other on parallel tracks, one at the rate 52 km/hr and another at 38 km/hr. In h...
