Question
The downstream speed of a boat is 6 km/hr more than its
upstream speed and the ratio of the speed of the boat in still water to the speed of the stream is 11:3. Find the total time taken by boat to travel 42 km downstream and 32 km upstream?Solution
Let the speed of boat in still water be x km/hr and that of stream be y km/hr. ATQ, ⇒ (x + y) – (x – y) = 6 ⇒ y = 3 km/hr ⇒ x = 3 × 11/3 = 11 km/hr Required time = [42/(11+3)] + [32/(11−3)] = 7 hr
More Boats and streams Questions
- 160, 340, 240, 480, 360, 720
256Â Â Â 768Â Â Â 96Â Â Â 288Â Â Â 35Â Â Â 108
384, 1152, 144, 432, 56, 162
5000, 4050, 3240, 2268, 1360.8, 680.4
- Find the wrong number in the given number series.
12, 21, 5, 38, 2, 71 191 341 221 331 251 281
- Find the wrong number in the given number series.
25, 34, 18, 34, 9, 46 12, 91, 172, 249, 328, 407
8 10.4 6.8 10.2 7.6 10
Find the wrong number in the given number series.
84, 120, 183, 246, 336, 444
Relevant for Exams:
