Question

If she purchased 3 more books
I-E
35. Sanvi purchased some books for Rs. 120. If she
have cost her Rs. 2 less. Find the
for the same amount each book would have
Sanvi and the price of each book
number of books purchased by Sanvi and then
OR
30 kms and again returns to the
A motor boat goes down the stream 30.
otal time of 4 hours and 30 minutes. If the speed
starting point in a total time of 4 ho
speed of the motor boat in still water.
stream is 5 km/hr, then find the speed of the motor boat in still water​

Answer 1

Answer:

OR

Let the speed of the stream be x km/hr. Then,

Speed downstream = (15 + x) km/hr,

Speed upstream = (15 - x) km/hr.

30 + 30 = 4 1

(15 + x) (15 - x) 2

900 = 9

225 - x2 2

9x2 = 225

x2 = 25

x = 5 km/hr