GRE
Exam
Numerical Ability
Time Distance and Speed
a man travels from X to Y at a average speed of 6m/hr and from Y to Z at 12m/hr.what is the average speed?
Read Solution (Total 6)
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- Can't be determined...because in question it is not specified the distance between X to Y and Y to Z is.If the distance is equal then the average speed will be=2*6*12(6+12)=8km/hr
- 10 years agoHelpfull: Yes(4) No(2)
- Avg speed=2xy/(x+y)
So, (2×6×12)/(6+12)
=8 km/hr - 10 years agoHelpfull: Yes(3) No(0)
- here we have one formula 2xy/(x+y)so,
if we apply that formula we will get 8 m/hr.
2*6*12/(6+12)=8 - 10 years agoHelpfull: Yes(1) No(0)
- avg speed=total dist/total time
let there be 12km(lcm of 6 and 12) distance eachfrom x to y and y to z
so avg speed =24/{(12/6)+(12/12)}=8kmph - 10 years agoHelpfull: Yes(0) No(0)
- 1600
is ans - 10 years agoHelpfull: Yes(0) No(1)
- 4
6*12/(6+12)=4 - 10 years agoHelpfull: Yes(0) No(0)
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