Question : A bus left 60 minutes later than the scheduled time, but to reach its destination 48 km away in time, it had to increase the speed by 4 km/hr from the usual speed. What is the usual speed (in km/hr) of the bus?

Option 1: 9

Option 2: 12

Option 3: 15

Option 4: 8

Question : A student walked 6 km from his house to reach the metro station, then boarded a metro that had an average speed of 60 km/hr, and reached the destination. It took 3 hours for the entire journey. If the average speed of the entire journey is 32 km/hr, then the speed of walking is ________.

Option 1: 1.5 km/hr

Option 2: 3 km/hr

Option 3: 2 km/hr

Option 4: 4 km/hr