a man walks 15km from p to q at the speed of 5km/hr and returns from q to pay tthe speed of 3km/hr.what is the average speed for the whole journey
Answers
Answer:
Step-by-step explanation: The question seems incomplete since it is not mentioned that the man walks from p to q, but I will assume so here(which is the only way to solve this question).
Now let x be the distance between p and q, so the total distance traveled is 2x. The formula for speed=distance/time. Here, we have the distance travelled, we need to find the time taken.
From p to q, the time= distance/speed=x/5.
Similarly from q to p, time=x/3.
Therefore, speed=distance/time=2x/((x/5)+(x/3))=15/4=3.75kmperhour.
An even better way to solve this would be to take the LCM of the speeds and assume it as the distance. Here, the distance would be 15. Now fill the values according to the question.
From p to q, time=15/5=3hrs.
From q to p, time=15/3=5hrs.
Speed=30/8=3.75kmperhour
thank you
Answer:
3.75km/hr
Step-by-step explanation:
p to q = 15km in 3hrs
q to p = 15km in 5hrs
Total 30kms in 8hrs
30/8 = 3.75 km/hr