The ratio of average speeds of four bike is 7: 9: 11: 12. If they all travel 156 km and the bike with least speed travel that distance in 144 min. Find the time taken by the bike which speed is most.

A bus travels 120 km at 60 km/h and 180 km at 90 km/h. What is the average speed for the entire journey ?

The average speed of a car, a bus and a train is 72 km per hour. If the speed of the bus is 48 km per hour, then average of the speeds of the train and the car is

I go to my school which is 5 km away from my home at a speed of 10 km/h and return home at the speed of 15 km/h. What is my average speed?

A man travels from Pune to Mumbai at 78 km/hr and returns at 91 km/hr. Find its average speed 

Daksh travels 774 km at 86 km/hr, the next 567 km at 63 km/hr and the next 135 km at 27 km/hr. What is his average speed (in km/hr, rounded off to two decimal places) for the whole journey?​

By increasing the speed of a car by 10 km/hour, the time of journey for a distance of 72 km is reduced by 36 minutes. The original speed of the car was:

A person drives 60 km at 30 km/hr, then 30 km at 60 km/hr, and 45 km at 90 km/hr. What is the average speed?

Tirupati travels 120 km at the speed of 48 km/hr and another 180 km at the speed 45 km/hr. What is Tirupati’s average speed (in km/hr) during the entire journey? (correct up to two decimal places)

Suman covers a certain distance by car, driving at 22 km/hr, and he returns to the starting point, riding on a scooter at a speed of 17 km/hr. Find the average speed for the whole journey.

A man travels at 50 km/hr for 2 hours, the next at 40 km/hr for 2.5 hours and the next at 60 km/hr for 3 hours. What is his average speed (in km/hr, rounded off to two decimal places) for the whole journey?