a car travels first 39 kilometer distance in 45 minutes, while next 25km distance in 35 minutes. what is it's average speed?
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Answer:
Step-by-step explanation:
..speed = distance/time..
⇒ s = 39/45 + 25/35
⇒ s =( 7×39)+ (9×25)/315
⇒ s = 273+225/315
⇒ s = 498/315
⇒ s= 166/105
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