Question

Anil, a student of class X goes to Ganga river with his father. When he sees a boat in the river, then he wants to sit in the boat. So his father Ramesh is ready to sit with him. In this order, Anil is sitting on a boat which goes upstream at a speed of 6km/h and returns downstream at a speed of 14km/h.. When Anil is in the boat, some questions arise in the mind. Please answer the following questions.

1. Find the speed (in km/h)of the boat in still water: *
1 point
(a)8
(b)10
(c)12
(d)14

2. Find the speed (in km/h)of stream. *
1 point
a)3
(b)4
(c)5
(d)6

Write the direction in which the speed is maximum *
1 point
(a)upstream
(b)downstream
(c)both have equal speed
(d)none of the above

Answer 1

1. Find the speed (in km/h)of the boat in still water: *

1 point

(a)8

(b)10

(c)12

(d)14

Answer :-

given that,

• upstream speed = 6 km/h .
• downstream speed = 14 km/h .

so,

→ Speed od boat in still water = (upstream + downstream)/2 = (6 + 14)/2 = 20/2 = 10 km/h (B)

2. Find the speed (in km/h) of stream. *

1 point

a)3

(b)4

(c)5

(d)6

Answer :-

→ Speed of stream = (Downstream - upstream)/2 = (14 - 6)/2 = 8/2 = 4 km/h (B)

Write the direction in which the speed is maximum *

1 point

(a)upstream

(b)downstream

(c)both have equal speed

(d)none of the above

Answer :-

→ upstream speed = 6 km/h .

→ downstream speed = 14 km/h .

since,

→ 14 > 6 .

→ downstream > upstream .

therefore, In downstream (B) speed is maximum .

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