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Speed of train = (Length of train + Length of Platform)/Required time Length of train = 440 m Crossing time of platform = 2 × 60 = 120 sec Length of platform = 440 × 2 = 880 m Let the speed of train be x. Speed of train = (440 + 880)/120 ⇒ x = 11 m/s
The average expenditure of a man for the first seven month is Rs.12000 and for the next five months is Rs.9000. If he saves 15000 in that year then find...
32 × 15 + 60% of 200 = ? + 120
The average marks of 50 students in an examination was 65. It was later found that the marks of one student had been wrongly entered as 83 instead of 38...
The average daily income of a daily wage worker, in the month of July is Rs. 120. If his average income on 1st 12 days of the month is Rs. 80 and on las...
The average age of A and B is 21 years. If A is to be replaced by C, the average would be 20 years. The average age of C and A is 22 years. Find the age...
The batting average of 40 innings of a cricket player is 50 runs. His highest score exceeds his lowest by 172 runs. If the two are excluded, the average...
Four persons ‘A’, ‘B’, ‘C’ and ‘D’ have different amounts with them. ‘D’ has twice amount than that of ‘A’. The amount ‘B’ h...
The average age of three children is 16 years. If their ages are in the ratio 3:4:5. Find the age of the youngest child.
