1. A dog takes 4 leaps for every 5 leaps of a hare but 3 leaps of a dog are equal to 4 leaps of the hare. Compare their speeds in terms of ratio of their speed.

(A) Dog’s speed : hare’s speed = 15 : 16
(B) Dog’s speed : hare’s speed = 16 : 15
(C) Dog’s speed : hare’s speed = 3 : 5
(D) Dog’s speed : hare’s speed = 5 : 3

2. The ratio of the speeds of two trains is 7 : 8. If the second train runs 400 kms in 4 hours, then the speed of the first train is—
(A) 70 km/hr
(B) 75 km/hr
(C) 84 km/hr
(D) 87 km/hr

3. In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age of B is—
(A)29years
(B) 19 years
(C) 49 years
(D) 39 years

4. Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in—

(A) 6 hours
(B) 6 2/3 hours
(C) 7 hours
(D) 7 ½ hours

5. The present ages of three persons are in proportions 4 : 7 : 9. Eight years ago, the sum of their ages was 56. Find their present ages (in years)—
(A) 20, 35, 45
(B) 8, 20, 28
(C) 16, 28, 36
(D) 20, 36, 46