If a boat goes upstream at a speed of 24 km/hr and comes back the same distance at 40 km/hr. What is the average speed (in km/hr) for the total journey?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 30
Let the distance = D km
A/Q
Average speed = 2D/(D/24 + D/40) = 2 × 120/8 = 30 km/hr