16. A boat takes 9 hours to travel a distance upstream and takes 3 hours to travel the same distance
downstream. If the speed of the boat in still water is 4 km/hr, what is the speed of the stream?
17. Kartik buys some apples at the rate of 10 per apple. He also buys an equal number of oranges at
rate of 6 per orange. He make a 15% profit on apples and 8% profit on oranges. The total profit earn
by Kartik at the end of the day is 396. When all fruit is sold out, find the number of apples purchased.
Answers
Answer:
(16) 2km/hr
Step-by-step explanation:
(16) x-y=d/9 and x+y=d/3
from speed=dist /time
taking d as common
(x-y)9=(x+y))3
subs x=4in eq
y=2km/hr
(17) Let the no. Of apples be=x
And the no. Of orenges be =y
Total cost=(10x+6y)Rs
Total frofit=396
Now he made a profit of 15%over apples and 8%profit over orenges...
Total profit=(10x*(15/100)+6y(8/100))Rs
=(150x+48y)/100.
Now...
(150x+48y)/100=396
150x+48y=39600
Answer:
Step-by-step explanation:
16. Let the speed of stream be x
Upstream speed = 4-x
Downstream speed = 4+x
Since the distance is same:
9(4-x) = 3(4+x)
36 - 9x = 3x + 12
12x = 24
x = 2km/hr
17. Let the number of apple and orange be x
Cost of apple = 10x
Cost of orange = 6x
15% profit on apple = 1.5x
8% profit on orange = 0.48x
Total profit = 1.5x + 0.48x = 1.98x
Given 1.98x = 396
x = 396/1.98
= 200