Question
A man rows 40 km upstream and 60 km downstream in 8
hours. If the ratio of his upstream speed to downstream speed is 2:3, then find the time required to travel 30 km upstream and 45 km downstream.Solution
ATQ,
Let the upstream and downstream speeds be 2x km/hr and 3x km/hr respectively. So, 40/2x + 60/3x = 8 = 20/x + 20/x = 8 = 40/x = 8 ⇒ x = 5 Required time = 30/2x + 45/3x = 30/10 + 45/15 = 3 + 3 = 6 hours
More Boats and streams Questions
14, 17, 23, 32, ?, 59
3, 8, 27, 124, ?
If series II follows the same sequence pattern as series I shown below, determine the value of 'p'.
Series I: 3, 4, 9, 34, 159, 784
Se...
12, 13, 27, 82, 329, ?
166    156    136   ?     66    16
11   6   7   12   26    ?    205.5
What value should come in the place of (?) in the following number series?
4, 10, 22, 46, ?, 190
1290, 1225, 1175, ?, 1112, 1095, 1085
230 192 172 ? 122 100
...150, 158, 131, 195, 70, ?Â
Relevant for Exams:
