Average speed for half distance at 20 m/s and half at 30 m/s

Half distance at 10 m/s and remaining half at 40 m/s. Average speed?

A bus travels 120 km at 60 km/h and 180 km at 90 km/h. Average speed?

A man walks at an average speed of 3 km/hr from his home and reaches office 40 minutes early. If he walks at an average speed of 2 km/hr, he would reach office 40 minutes late. What is the distance b…

Without stoppages, a train travels at an average speed of 60 km/h and with stoppages it covers the same distance at an average speed of 48 km/h. How many minutes per hour does the train stop?

The distance between Delhi and Agra is 200 km. Suppose you are travelling from Delhi to Agra by a car. If you can maintain an average speed of 90 km/hr for 120 km and 40 km/hr for the remaining dista…