A car travels 101 km in the first hour and 55 km in the second hour. What is the average speed (in km/h) of the car for the whole journey?
A78
B81
C79
D73
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The speed of a boat in still water is 13 km/h and the speed of the stream is 4 km/h. How much more time will it take in going upstream than ingoing downstream a distance of 68 km? (Correct to the nearest minute)
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