Aman goes uphill with average speed of 30 km/h and comes down with an average speed of 40 km/h. The distance travels in both cases being the same. The average speed for the entire journey is ________.
Answer & explanation
Correct answer: option 1
S1 = 30km/h
S2 = 40km/h
Average speed = 2( s1 × s2 )/(s1 × s2 )
= 2( 30 × 40 )/(70 ) = 34.28 km/h