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Start learning 50% faster. Sign in nowSpeed of train = 800/20 = 40 m/sec Let the speed of the man be ‘s’ m/sec Relative speed of the train = (40 – s) m/sec According to the question, (40 – s) = 800/40 Or, s = 40 – 20 = 20 Therefore, speed of the man = 20 m/sec
The average weight of 8 persons is increased by 2.5 kg, when a person whose weight is 56 kg, is replaced by a new comer. Find the weight of new comer?
If average of first 9 numbers is (n – 50) and the sum of remaining number is 1620. Find the value of ‘n’, if the average of 21 numbers is ‘n’....
The average of four consecutive odd numbers is 34. Find the largest of these numbers.
The average expenditure of a man for the first 5 month is Rs.4000 and for the next 7 months is Rs.6000. If he saves 10000 in that year then find his ave...
In a class of 40 students, the average weight of the boys is 48 kg, and the average weight of the girls is 56 kg. If the overall average weight of the c...
15 years ago, the average age of all the 80 teachers of the college was 50 years. 8 years ago, the principal has retired from her post at the age of 60 ...
