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 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 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 : A person takes 40 minutes more than his usual time when he covers a distance of 20 km at 5 km/hr. If he covers the same distance at 8 km/hr, he takes $x$ minutes less than the usual time. What is the value of $x$?

Option 1: 48

Option 2: 54

Option 3: 45

Option 4: 50

Question : A takes 2 hours 30 minutes more than B to walk 40 km. If A doubles his speed, then he can make it in 1 hour less than B. What is the average time taken by A and B to walk a 40 km distance?

Option 1: 7 hours 15 minutes

Option 2: 5 hours 45 minutes

Option 3: 6 hours

Option 4: 5 hours 15 minutes