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Let the length of the train = x meter So according to question: x/14 = (x + 480)/30 30x = 14x + 6720 16x = 6720 x = 420 So the length of the train = 420 m Speed of the train = 420/14 = 30 m/s Time taken by the train to cross a bridge 600 meter long = (420 + 600)/30 = 1020/30 = 34 seconds
18 years ago the average age of a family of four members was 45 years. Two children were born in that span of 18 years. The present average age of the ...
The average age of A and B is 22 years. If A is to be replaced by C, the average would be 20 years. The average age of C and A is 23 years. Find the age...
The average age of 32 children and their teacher's age are 28 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
The average of five even numbers is 64. If we replace two of these even numbers, 84 and 92, with a single even number X, the new average decreases by 4....
The average age of 33 children and their teacher's age are 25 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
Three natural numbers are given. If sum of average of any two numbers and the remaining third number is 56, 46 and 50 respectively, then find the sum o...
Average marks scored by Vineet in five subjects are 75. The average marks scored by him (excluding his highest and lowest marks) are 60 and lowest marks...