Question
A man can row at 15 km/hr in still water. If the
velocity of current is 3 km/hr and it takes him 1 hour to row to a place and come back, how far is the place?Solution
Let the distance be x km. Speed upstream = 15 – 3 = 12 km/hr Speed downstream = 15 + 3 = 18 km/hr ⇒ x/12 + x/18 = 1 ⇒ (3x + 2x)/36 = 1 ⇒ 5x = 36 ⇒ x = 36/5 = 7.2 km
More Boats and streams Questions
- Select the number from among the given options that can replace the question mark (?) in the following series.
17, 18, 22, 31, 47, ___ - Which letter and number cluster will replace the question mark (?) to complete the given series?
LT6, KU12, IW24, FZ48, ____ - A series is given with one term missing. Choose the correct alternatives from the given ones that will complete the series.
57, 59, 56, 61, 54, ___ - Which letter-cluster will replace the question mark (?) in the following series?
RGV, UME, ?, AYW, DEF - Which letter-cluster will replace the question mark (?) in the following series?
NPQR, OORQ, PNSP, ____, RLUN
