The speed of a boat in still water is 5 km/hr more than
that of the current. The time taken by the boat to cover 425 km downstream is 8.5 hours. Find the total time taken by boat to travel 550 km downstream and 45 km upstream.
A20 hoursCorrect AnswerIncorrect Answer
B25 hoursCorrect AnswerIncorrect Answer
C23 hoursCorrect AnswerIncorrect Answer
D15 hoursCorrect AnswerIncorrect Answer
ENone of theseCorrect AnswerIncorrect Answer
Solution
Therefore, downstream speed of the boat = 425/8.5 = 50 km/hr And, upstream speed of the boat = 5 km/hr Required time taken = (550/50) + (45/5) = 11 + 9 = 20 hours