Time, Distance and Speed , Aptitude

In every hour, a cyclist covered 1 km more distance than he was to cover with his original speed on $1×1/4$ hour.
So he covered 96 km distance early by 2 hours.
The original speed of cyclist (km/hr) is 

Option :
A. 12
B. 14
C. 16
D. 18

Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph.
For how many minutes does the bus stop per hour ?

Option :
A. 20
B. 12
C. 10
D. 9

Walking (6/7)th of his usual speed, a man is 12 minutes too late.
The usual time taken by him to cover that distance is:

Option :
A. 1 hr 12 min
B. 1 hour
C. 1 hr 20 min
D. 1 hr 15 min

A car taken 5 hours to cover a distance of 300 kms.
How much should the speed in km/hour be maintained to cover the same distance in 4/5th of the previous time ?

Option :
A. 48 km/hour
B. 120 km/hour
C. 60 km/hour
D. 75 km/hour

If a man reduces his speed to 2/3, he takes 1 hour more in walking a certain distance.
The time (in hours) to cover the distance with his normal speed is :

Option :
A. 2
B. 1
C. 3
D. 1.5