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Let speed of the boat in still water be ‘3x’ km/h. Speed of the boat in upstream = 3x ÷ 3 = ‘x’ km/h Speed of the stream = 3x – x = ‘2x’ km/h Speed of the boat in downstream = 3x + 2x = ‘5x’ km/h ATQ; (22/44) × 60 = 30 So, 5x = 30 Or, x = 6 So, speed of the boat in still water = 3 × 6 = 18 km/h
Average marks scored by Vineet in five subjects are 72. The average marks scored by him (excluding his highest and lowest marks) are 56 and lowest marks...
Average run scored by a batsman in first ‘x’ matches is 43. In next 14 matches he scored runs with an average of 63 so that his overa...
In an examination, the average marks obtained by the students is 40. After correcting the quantitative mistakes, the average of 50 students is reduced t...
A group contains some number of members. If 2 members with an average weight of 61 kg leave the group, the average weight of the remaining members decre...
The average age of 22 children and their teacher's age are 20 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
Virat Kohli's strike rate after facing 'b' balls is 120. In the subsequent 15 balls, he scores an additional 39 runs, leading to ...
The average age of 26 children and their teacher's age are 22 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
The average salary of a group of 12 employees is Rs. 60,000. When one employee departs, the average salary of the remaining 11 employees drops by Rs. 2,...
The average profit of a shop for the first 3 months is Rs.500 per month. If the shop owner wants the average profit to be Rs.800 per month over 6 months...
The cost of packaging of the oranges is 15% the cost of fresh oranges themselves. The cost of oranges increased by 35% but the cost of packaging decreas...
