Question

car speed of 60 km per hour for 50 km and 80 kilometre per hour for the next 50 kilometre what is the average speed in kilometre per hour of a jou
rney of 100 km

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Answer 1

Explanation:

average speed =

total distance/total time

speed = distance/time

60 = 50/t1

t1 = 5/6 min

similarly we'll get t2 as 5/8 min

average speed =

total distance/total time

$\frac{100}{ \frac{5}{6} + \frac{5}{8} } \\ \frac{100}{ \frac{70}{48} } \\ \frac{4800}{70} \\ \frac{480}{7}$