Question
The average weight of a group of five persons, A, B, C,
D, and E is 100 kg. If another person K joins the group then the average weight of the group is decreased by 2.3 kg, then find the weight of K.Solution
Total weight of A, B, C, D, and E together = 100 × 5 = 500 kg Weight of K = 97.7 × 6 – 500 = 586.2 – 500 = 86.2 kg
Ratio of the lengths of two trains ‘X’ and ‘Y’ is 5:6 respectively and the ratio of time taken by them to cross a pole is 3:4 respectively. If s...
- A train running at 90 km/h takes 18 seconds to pass a pole. Find the approximate time required for the train to cross a platform that is 0.8 times the leng...
A train 120 m long runs at a speed of 54 km/h. How much time will it take to cross a telegraph pole? (Use 1 km/h = 5/18 m/s)
A 300-metre-long train takes 12 seconds to cross a pole. Due to engine fault, the speed is reduced by 20%. Find the time taken by the train to cross a p...
Humsafar express leaves Howrah station at a certain time. After 2 hours, Vande Bharat leaves the same station and travels in the same direction at a spe...
A 240 m long train clears a platform of length 160 m in 16 seconds. The ratio of its speed to that of another train is 5:6. Find the length of the secon...
Two trains ‘G’ and ‘H’ of equal lengths are running on parallel tracks at speeds of 30 m/s and 90 m/s, respectively. If they can cross each othe...
A train crosses a pole and a platform of length 300 metres in 5 seconds and 20 seconds, respectively. Find the length of train.
A goods train leaves a station at a certain time and at a fixed speed. After 11 hours, an express train leaves the same station and moves in the same di...
- A train can cross a bridge and a pole in 7.5 seconds and 5 seconds respectively. The length of the bridge is 50 metres. Find the time taken by train to cro...
Relevant for Exams:
