Let the speed of the boat in still water be B km/h and the speed of the stream be S km/h. From the given data: Upstream speed = B - S = 45 km / 6 hours = 7.5 km/h. Downstream speed = B + S = 60 km / 4 hours = 15 km/h. Solving these two equations: B - S = 7.5 and B + S = 15. Adding the two, 2B = 22.5 → B = 11.25 km/h. Substituting B = 11.25 into B + S = 15: S = 3.75 km/h. Now, the speed of the current is doubled, so the new speed of the stream is 2 * 3.75 = 7.5 km/h. The new downstream speed = 11.25 + 7.5 = 18.75 km/h. Time to travel 90 km downstream = 90 / 18.75 ≈ 4.8 hours.
Which of the following can be inferred from the given statement? (An inference is something which is not directly stated but can be derived from the giv...
Change the question mark with the option that follows the applied logic in the first pair.
1125 : 18 :: 1356 : ??
In this question, there are two statements showing relations, after which I, ii and iii have been given three conclusions. Assuming that the given state...
Select the option that represents the correct order of the given words as they would appear in an English dictionary.
1. Luxury
2. Lyrics<...
In the following question, select the figure which can be placed at the sign of question mark (?) from the given alternatives.
Three of the following words are alike in some manner and hence form a group. Which word does NOT belong to that group? (The words must be considered as...
Select the number from the given alternatives that can replace the question mark (?) in the following series.
198, 149, 113, 88, ?
If D = B > C = F and F < B = E < A, then which of the following options is NOT correct?
Which of the following numbers will replace the question mark (?) in the given series?
13, 21, ?, 69, 133
Which of the following numbers will replace the question mark (?) in the given series?
115, 130, 122, 137, 129, ?
