Let the speed of the man be lsquo;xrsquo; m/sec. Speed of train = 1260/21 = 60 m/sec Relative speed of the train = (60 ndash; x) m/sec According to the question, =gt; (60 ndash; x) = 1260/30 =gt; x = 60 ndash; 42 =gt; x = 18 Therefore the speed of the man = 18 m/sec
The average age of A and B is 17 years. If A is to be replaced by C, the average would be 16 years. The average age of C and A is 18 years. Find the age...
The average wage of a group of 25 labourers is Rs. 470. If 4 persons receiving average wage of Rs. 350 leave the group and 2 persons receiving average w...
The average marks scored by 20 boys and 45 girls are 88 and 94 respectively. Find the average marks scored by all the students together. (Answer should ...
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...
Average run scored by a batsman in first ‘x’ matches is 70. In next 12 matches he scored runs with an average of 90 so that his overa...
The average salary of 400 employees were found to be Rs. 250. Later on, it was discovered that the wages of two workers were misread as 260 and 140 inst...
There are three distinct numbers ‘a’, ‘b’ and ‘c’. If, a = 150, (a + b) = 450 and (c – b) = 60, then find the average of a, b and c.
...The average expenditure of a man for the first 3 month is Rs.6000 and for the next 9 months is Rs.7500. If he saves 15000 in that year then find his ave...
The average number of books on history, polity and geography in a library is 144, and the average number of books on history and geography is 140. If th...
The average age of A and B is 16 years. If A is to be replaced by C, the average would be 15 years. The average age of C and A is 17 years. Find the age...
