Question

Ratnagiri is 360 km from. pavizhamala gopikas family travelled in a car , at an average speed of 60 km /hour . they managed only 40 km / hour during the return trip. what is the average speed of the entire trip​

Answer 1

Answer:

48 kmph

Step-by-step explanation:

distance here constant so

average speed =

$\frac{2xy}{x + y}$

x=60 kmph

y=40 kmph

apply

$\frac{2 \times 60 \times 40}{60 + 40} \\ \\ \\ = \frac{4800}{100} = 48 \: \frac {km}{hr}$

Answer 2

Answer:

Average Speed of the Entire Trip = 48 km/hr

Step-by-step explanation:

Step 1:

Given - Let the two points be A and B, and the distance between them is 360 Km.

Now, while travelling 'A to B':

Distance (D1) = 360 KM

Average Speed (V1) = 60 Km/Hr

Time Taken (T1) = Distance (D1) / Speed (V1)

=> T1 = 360/60 = 6 Hours

Similarly, while travelling 'B to A':

Distance (D2) = 360 Km

Average Speed (V2) = 40 Km/Hr

Time Taken (T2) = 360/40 = 9 Hours

Step 2:

Average Speed of the Entire Trip ('A to B' + 'B to A') = Total Distance Covered / Total Average Speed

=> D1 + D2 / V1 + V2 => 360 + 360 / 9 + 6

=> 720 Km / 15 Hours

=> Average Speed = 48 Km/Hours