Question

A car travels 90 km at a speed of 30 km/h and then 150 km at a speed of 50 km/h. Find the total time taken and the average speed for the whole journey.

A 2 hrs and 20 km/h
B 7 hrs and 40 km/h
C 6 hrs and 40 km/h
D 1 hrs and 45 km/h
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