Question

a man drives 180 km from City a to city B in 4 hours 10 minutes and returns to city a in 3 hours 20 minutes find the average speed of the whole journey​

Answer 1

Answer:

48 km/hr

Step-by-step explanation:

As we have given in the question man drives 180 km in 4 hrs 30 min from the city a to city b

Now we need to find the average speed of the car for the whole journey as he returns the same distance in 3 hrs 20 min.

So, $average speed=\dfrac{D}{T}$

So the total distance covered by man=360 km and the total time has taken is

=7 hrs 30 min.=7.5 hrs

Therefore the average speed and our final answer would be

$S=\dfrac{360}{7.5}$=48 km/hr

Answer 2

Answer:

48 km/hr

Step-by-step explanation:

As we have given in the question man drives 180 km in 4 hrs 30 min from the city a to city b

Now we need to find the average speed of the car for the whole journey as he returns the same distance in 3 hrs 20 min.

So, average speed=\dfrac{D}{T}averagespeed=

T

D

So the total distance covered by man=360 km and the total time has taken is

=7 hrs 30 min.=7.5 hrs

Therefore the average speed and our final answer would be

S=\dfrac{360}{7.5}S=

7.5

360

=48 km/hr