Answer:
(A) Velocity of car in order just to clear the river and land safely on the opposite side is 
(B) The speed of the car is 
Explanation:
Given:
Car distance from river
m
Mere distance from river
m
River length
m
(A)
For finding the velocity of car,
Using kinematics equation we find velocity of car

Where
,
( given in question )

sec
The speed of the car before it lands safely on the opposite side of the river is given by,

(
)

(B)
For finding the speed,
The horizontal distance travel by car,

Where



For finding the speed,



Therefore, the speed of the car is 