Answer:
Total
time= 0.5 h + 0.25 h + 0.75 h = 1.5 h
Total
distance \[={{\upsilon }_{1}}{{t}_{1}}+{{\upsilon }_{2}}{{t}_{2}}+{{\upsilon
}_{3}}{{t}_{3}}\]
= (60)
(0.5) + (24) (0.25) +(72) (0.75)
= 90
km
Average
speed
\[\text{=}\frac{\text{Total}\,\text{distance}}{\text{Total}\,\text{time}}\text{=}\frac{\text{90}\,\text{km}}{\text{1}\text{.5h}}\text{=60km/h}\]
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