Let speed of the stream be x km/hr. then speed of the motorboat in upstream will be
A) 20km/hr
B) (20 + x)km/hr
C) (20 – x )km/hr
D) 2km/hr
Answers
Given Let speed of the stream be x km/hr.
speed of the motorboat in still water = 20 km/hr
To Find : speed of the motorboat in upstream will be
A) 20km/hr
B) (20 + x)km/hr
C) (20 – x )km/hr
D) 2km/hr
Solution:
upstream means going against stream hence stream velocity is opposite to motor boat
Hence motor boat speed in upstream = speed of the motorboat in still water - speed of stream
= 20 - x km/hr
(20 – x )km/hr is correct option
speed of the motorboat in upstream = (20 – x )km/hr
Additional info:
Down stream means , going into the direction of stream hence stream speed will be added
Hence motor boat speed in downstream = speed of the motorboat in still water + speed of stream
= 20+ x km/hr
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Answer:
c) (20-x)km/hr