Tina took 7/3 hours to travel 4/9 of the distance between town A and town B at an average speed of 72km/hour. what was Tina's average speed if she took 4 hours 12 minutes to travel from town A to town B. 

Asked by anjuparihar05 | 20th Sep, 2018, 12:47: PM

Expert Answer:

let the total distance be x
tina took 7/3 hours to travel 4/9x distance at speed of 72 km/hr
so 
distance = speed x time
4/9x = 7/3×72
x= 378 km
now new time is 4 hrs + 12 mins
4 + 12/60 hours
time = 21/5 hours
speed = distance/time
=378×5/21
=90 km/hr

Answered by Arun | 20th Sep, 2018, 01:39: PM

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