Bala travels first one-third of the total distance at the speed of 10 kmph and the next one-third distance at the speed of 20 kmph and the last one – third distance at the speed of 60 kmph. What is the average speed of bala?
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let a = the average speed for the trip
write a time equation; time = dist/speed; assume the total dist = 3
 +  +  = 
multiply eq by 60a, cancel the denominators and you have
6a + 3a + a = 60(3)
10a = 180
a = 180/10
write a time equation; time = dist/speed; assume the total dist = 3
 +  +  = 
multiply eq by 60a, cancel the denominators and you have
6a + 3a + a = 60(3)
10a = 180
a = 180/10
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