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Let the total number of students be x Average marks obtained by the students = 75 Total marks = 75 x After correcting the quantitative mistakes the average decreased by (75-60) = 15 marks Total reduction = 15 × 100 = 1500 Now According to the Question, (75x-1500)/x = 70 70 x = 75 x – 1500 x = 300 Total number of students = 300
Two trains ‘A’ and ‘B’ started from station ‘P’ and ‘Q’ towards station ‘Q’ and ‘P’ respectively at the same time. When they met...
A 280 m long train crosses a platform twice its length in 2 min. Find the speed of the train.
A train running at 25 km/hr takes 36 seconds to pass a platform. Next, it takes 14 seconds to pass a man walking at 7 km/hr in the same direction. Find ...
A train takes 22 seconds to cross a platform and 9 seconds to cross a pole. If the length of the train is 50 metres less than the length of the platform...
Two cars start from a place with a speed of 75 km/hr at an interval of 17 minutes. What is the speed of a man coming from the opposite direction towards...
A train approaches a tunnel a PQ. Inside the tunnel a cat located at a point i.e., 7/16 of a distance PQ measured from the entrance P. When the train wh...
A train can cross a pole in 36 seconds. While if the train increased its speed by 50% then time taken by it to cross 324 metres long platform is 42 seco...
A train running at a speed of 90 km/h crosses a bridge in 45 seconds. If the length of the train is x meters, and length of the bridge is (6x+75) meters...
1260 metres long train crosses a man who is moving in the same direction with a certain speed in 30 seconds. If the same train can cross a pole in 21 se...
A train can cross a pole in 32 seconds. While if the train increased its speed by 45% then time taken by it to cross 289 metres long platform is 42 seco...
