Question
"A" can finish a task in 36 days, while "B" can
complete it in 45 days. Both start working on the task together, but "A" stops working after "x" days. The entire task is completed in 30 days. Find the value of "x".Solution
Let, total amount of work = 180 units (LCM of 36 and 45) Efficiency of A = 180/36 = 5 units per day Efficiency of B = 180/45 = 4 units per day According to question; 9 × x + 4 × (30 – x) = 180 Or, 9x – 4x = 180 – 120 Or, 5x = 60 Or, x = 12
The speed of train X is 72km/h and it takes 25 seconds to cross a pole. Find the time taken by train X to cross train Y running in the same direction at...
A train 120 m long passes a man standing on a platform in 8 seconds. What time (in seconds) will it take to pass completely over a platform 180 m long a...
A train can cross a pole in 10 seconds while it can cross a 360 metres long platform in 30 seconds. Find the time (in hours) taken by the train to cover...
Two trains of same length are running in parallel tracks in the same direction with speed 45 km/hr and 105 km/hr respectively. The latter completely cro...
The "Sunrise" train departs from City A at a specific time. Four hours later, the "Twilight" train leaves the same station and travels in the same direc...
Train ‘L’ is travelling with a speed of 90 km/hr and crosses a vertical pole in 4 seconds. Train ‘K’ is 60 metres longer than ‘L’ and trave...
The distance covered by a train in (5y – 1) hours is (125y³ – 1) km. The speed of the train is.
A train crosses a pole in 18 seconds and crosses a platform 270 m long in 36 seconds. What is the speed of the train?
Two trains approach each other at 16 kmph and 22 kmph from 2 places 266 km apart. After how many hours they will meet?
A train can cross a pole in 18 seconds. When the length of the train is increased by 50 metres, it now takes 169 seconds to overtake a car running in th...
Relevant for Exams:
