A person trvels from P to Q at a speed of 20 km/hour and returns from Q to P at a speed of 30 km/hour. Find the average speed of his total journey ?
a. 25 km/hour
b. 24 km/hour
c. 26 km/hour
d. 23 km/hour
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Answer_25km/hour. How? Here's the answer. How many times does the person traveled? Answer_ 2 times (From P to Q and from Q to P). How much does he traveled in total journey? Answer_20km + 30km = 50km. Then the average will be 50/2 km/hr which equals to 25 km/hour.
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