Question : A motorcyclist left $6\frac{6}{9}$ minutes later than the scheduled time but to reach its destination 21 km away on time, he had to increase his speed by 12 km/hr from the usual speed. What is the usual speed (in km/h) of the motorcyclist?

Option 1: 28

Option 2: 35

Option 3: 42

Option 4: 64

Question : A car left 3 minutes earlier than the scheduled time and to reach the destination 126 km away in time, it has to slow its speed by 6 km/hr from the usual. What is the usual speed (in km/hr) of the car?

Option 1: 56

Option 2: 63

Option 3: 94.5

Option 4: 126

Question : If Abhi travels a certain distance at 6 km/hr, he reaches his destination 12 minutes early, but if he travels at 4 km/hr, he reaches his destination 10 minutes late. The speed (in km/hr) at which he should travel to reach his destination on time is _____.

Option 1: $5 \frac{1}{4}$

Option 2: $5 \frac{1}{8}$

Option 3: $4 \frac{3}{7}$

Option 4: $4 \frac{5}{7}$

Question : A vehicle is going at one-fourth of its usual speed and it takes an extra 45 minutes to reach its destination. It's usual time to cover the same distance is:

Option 1: 15 minutes

Option 2: 10 minutes

Option 3: 30 minutes

Option 4: 20 minutes

Question : During a journey of 120 km, Rahi drives the first 60 km at the speed of 60 km/hr, the next 30 km at 60 km/hr and the remaining 30 km at the speed of 30 km/hr. Determine the average speed.

Option 1: 48 km/hr

Option 2: 33.33 km/hr

Option 3: 50 km/hr

Option 4: 40 km/hr