Measurement of Time and Speed

Two cyclists rode. One covered 10 km, the other 6 km. Kashish says the first cyclist must have gone faster, since they covered more distance. Does this settle it?

Aryan says a speed of 5 m/s is less than a speed of 10 km/h, because 5 is smaller than 10. His sister says you have to put both into the same units first. Who is right?

A car travels at a steady, unchanging speed. In 1 hour it covers 40 km. Roshni says in 3 hours it will definitely cover 3 times as much, that is 120 km, provided the speed stays the same. Is Roshni right?

On a round clock, the hour hand and minute hand look similar, just different lengths. Samar says both hands turn at the same speed since they are on the same clock. Is Samar right?

A bus journey works out to an average speed of 50 km/h. Daksh says this means the bus travelled at exactly 50 km/h for the whole trip. His mother says that is not necessarily true. Who is right?

Two buses, X and Y, both had an average speed of 50 km/h. Daksh says this means both took the same time for their journeys. His mother says not necessarily. Who is right?