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Let, the speed of boat be b km/hour and speed of current be s km/hour Average speed = 2xy/(x+y) (here, x is speed of downstream and y is speed of upstream) = (2 (b+s)(b-s))/((b+s+b-s)) = (b2 - s2)/b = (225 - 25)/15 = 200/15 = (40/3) km/hour Alternate Method :- 
Average speed = (Total distance covered)/(total time taken) = (2×60)/9 = 120 /9 = 40/3 kmph
‘Lavish’ is related to ‘Austere’ in the same way as ‘Prejudiced’ is related to ‘________’. (The words must be considered as meaningful E...
In a certain code language, ‘sit on chair’ is coded as 'sk mi cn' and ‘the chair broke’ is coded as ‘gm fr mi’. How is ‘chair’ coded in ...
In each of the given number-clusters, the number on the right side of = (the equal to sign) is calculated by performing certain mathematical operations ...
Select the Venn diagram that best illustrates the relationship between the following classes.
Pens, Books, Erasers
In the word ‘PREPARATION’, if the consonants used are arranged in the alphabetical order from left to right, then which letter will come at the 4th ...
If the following words are arranged alphabetically as per the order in the dictionary, which word will be the second word?
1. Magical
2. M...
In a code language, tomato is called brinjal, brinjal is called radish, radish is called cabbage and cabbage is called okra. Which one of the following ...
Select the word-pair that best represents a similar relationship to the one expressed in the pair of words given below. (The words must be considered as...
Which one of the following is NOT an element?
Kirti's grandmother, the mother of Vivek's mother, is the mother of Manish. Venu is the father of Kirti. How is mother of kirti related to discrimination?
