Question
A motor boat covers a certain distance downstream in a
river in 5 hours. It covers the same distance upstream in 5 hours and 30 minutes. If the speed of water is 2 km/h, then the speed of the boat in still water is:Solution
Let the speed of boat in still water be x km/hr and the distance be y km. Rate downstream = (x + 2) km/hr Rate upstream = (x – 2) km/hr According to the question, y/(x + 2) = 5 --- (i) y/(x – 2) = 11/2 --- (ii) On dividing equation (i) by (ii), (x – 2)/(x + 2) = 5/(11/2) = 10/11 11x – 22 = 10x + 20 x = 22 + 20 = 42 kmph
A man deposited 40% of his salary to a bank which offers compound interest at the rate of 10% p.a. If the interest earned by him from the bank after 2 y...
When a number is increased by 20% then the number obtained is 54 less than thrice the original number. Find the original number.
EPFO is under the administrative control of which Ministry?
Match List-I with List-II and select the correct answer using the codes given below the lists:
Which of the following statements is/are correct regarding The Maternity Benefit (Amendment) Act 2017?
       I.           Th...
Which one of the following diagrams is most appropriate to the statement, "Tea-producing places are either in Assam or in Bengal"?
Grassland with scattered trees
Which of the following statements is/are related to ecosystem?
(i) It consists of biotic components comprising living organisms.
(ii) All ...
The unitarist perspective assumes that:
Which of the following statements are correctly matched
1.GOAL 3: Gender EqualityÂ
2.GOAL 6: Decent Work and Economic Growth
3.GOA...
