Let the Length of train train be L meter and length of platform be P meter. Speed of train = 54 km/h = 54 × (5/18) = 15 m/s Here, (L /15) = 36 ⇒ L = 540 m Also, (540 + P)/15 = 52 ⇒ 540 + P = 780 ⇒ P = 240 m
The average age of a class of 25 girls is 20 years. If 7 new girls having average age of 12 years join the class, then the average age of the class beco...
The total number of students in class A and B is 72. The number of students in A is 40 more than that in B. The average marks of students in B are 50% m...
The average of five even numbers is 36. If we replace two of these even numbers, 82 and 88, with a single even number X, the new average decreases by 4....
The average number of taxis of three colours (black, white and yellow) in a taxi stand is 140. The number of black taxis is 24 more than that of yellow ...
There are 15 numbers such that average of first 12 numbers is 80 while the average of last five numbers is 110. Find the 12th number, if the ratio betwe...
The average age of 10 men is increased by 2 years when two of them whose age are 24 and 26 years replaced by two new men. The average age of the two new...
5 positive numbers are written on a piece of paper. Sum of first 3 numbers is 55 and ratio of the 4th and the 5th number is 2:3. If difference between t...
The average age of a group of nine children is 7 years. From the group, three children, whose ages were 3 years more, 2 years more, and 4 years more tha...
Average of four consecutive prime numbers S1, S2, S3, and S4 is (16 + x). If the average of S1 and S2 is (12 + x) and the average of S3 and S4 is (12 + ...
Average age of A, B and C is 20 years. Average age of B and C was 12 years when A was born. If B is 21 years old, then, find the age of C, 6 years hence.
