Question

Q-18. Case study 2
On a bright Sunday morning three friends A, B and C decided to go on river for fishing
and boating. They decided to leave for the place together in the evening. The journey
was smooth, it just went as scheduled then they reached to the river, and started to set
the boat on sail. They were enjoying their ride with full speed. They started boating from
a place to another place which is at a distance of 42 km and then again returns to the
starting place. They took 20 hours in all. The time taken by them riding downstream in
going 14 km is equal to the time taken by them riding upstream in going 6 km.
3
Based on the above situation, answer the following questions:
(0) Form the pair of linear equations in two variables from this situation.
() Find the speed of the boat in still water, and the speed of river.
(ii) The speed of boat in upstream is
(a) 5 km/hr (b) 2 km/hr
(c) 3 km/hr
(d) 6 km/h
(iv) At what time they will reach the destination, if the speed of boat is increased by 1
Km/hr and the speed of river is decreased by 1 km/hr?
(v)What will be the speed of boat in down stream.?​

Answer 1

Answer:

Step-by-step explanation:

Speed of the current = 1 km/hr.

II. PQ = 4 km.

Let the speed of the boat in still water be x km/hr. Then,

(x+1)

4

​  

+  

(x−1)

4

​  

=3 This gives x

∴ Correct answer is (E).

Answer 2

Answer:

correct answer is in attachment