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.

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 train travels the first 200 km of a journey at a speed of 100 km/h and the remaining 150 km at a speed of 75 km/h. What is the average speed (in km/h) of the train for the entire 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?