A. 80 days
B. 100 days
C. 120 days
D. 150 days
A. 1 : 2
B. 3 : 1
C. 2 : 1
D. 1 : 3
Explanation:
Let the speed of the boat in still water be 4 km/hr and speed of the current be u km/hr.
Rate downstream = (u + v) km/hr.
Rate upstream = (u- v)km/hr
Let the distance covered in each case be x km.
Then 2x/(u + v) = x / (u – v)
=> 2 (u – v) = ( u + v)
=> u =3v
=> u/v =3/1
A. 4 years
B. 6 years
C. 2 years
D. 3 years
Explanation:
9261 = 8000(21/20)N
(21/20)3 = (21/20)N => N = 3
A. 2 : 5
B. 1 : 5
C. 3 : 5
D. 4 : 5
The volume of the cone = (1/3)πr2h
Only radius (r) and height (h) are varying.
Hence, (1/3)π may be ignored.
V1/V2 = r12h1/r22h2 => 1/10 = (1)2h1/(2)2h2
=> h1/h2 = 2/5
i.e. h1 : h2 = 2 : 5
A. 47.5
B. 50
C. 45
D. 40
A. 40
B. 44
C. 48
D. 52
Explanation:
Let the capacity of the can be T litres.
Quantity of milk in the mixture before adding milk = 4/9 (T – 8)
After adding milk, quantity of milk in the mixture = 6/11 T.
6T/11 – 8 = 4/9(T – 8)
10T = 792 – 352 => T = 44.
A. Remains same
B. 5% decrease
C. 5% increase
D. 10% increase
Explanation:
100 * 100 = 10000
125 * 80 = 10000
No change