Two boys starts from the same place walking at the rate of 5 kmph and ...
In this type of questions we need to get the relative speed between them,
The relative speed of the boys = 5.5kmph – 5kmph
= 0.5 kmph
Distance between them is 8.5 km
Time = Distance/Speed
Time= 8.5km / 0.5 kmph = 17 hrs
View all questions of this testTwo boys starts from the same place walking at the rate of 5 kmph and ...
You have to first find relative speed by simply substracting the both.
Relative speed = Speed of B - Speed of A
= 5.5 kmph - 5 kmph
= 0.5 kmph
Now, put it in equation:-
Time = Distance/ speed
t= d/s = 8.5/0.5= 17 hours
However, the correct answer is (a) 17 hours
Two boys starts from the same place walking at the rate of 5 kmph and ...
Yes .5 is the difference of speed thus the difference of distance will be divisor of 8.5. therefore 17*0.5 will give 8.5.