Question

Anil a student of class X goes to Ganga rivers with his father. When he saw a boat in the river, then he wants to sit in boat. So his father Ramesh is ready to sit with him. In this order Anil is sitting on a boat which upstream at a speed of 6km/h and downstream at a speed of 14 km/h. When Anil is in the boat , some questions are arises in the mind, then answer the following question.
i) Find the speed (in km/h) of the boat in still water ? a)10 b)12 c)14 d)8

ii) Find the speed (in km/h) of stream ? a)3 b)4 c)5 d)6

iii) Write the direction in which the speed is maximum. a) Upstream b)Downstream c) Both have equal speed d) None of the above

iv) Find the average speed of stream and boat in still water. a) 7 km/h b)10 km/h c)12 km/h d) 5 km/h​

Answer 1

Step-by-step explanation:

Let speed of boat in stream be y

speed of boat in still water be x

upstream = x-y

downstream= x+y

$x - y = 6 \\ x + y = 14$

by elimination method x = 10,y =4

Answer key

1

(b) 10

2

(b) 4

3

(a) a pair of linear equation

4

(b) downstream