A man completes a journey in ten hours.He travels at a speed of 21 km/h for the first half of the journey and at a speed of 24 km/h for the second half. Calculate the total distance travelled (in kilometres).
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 224.
Formula used:
Speed = Distance/time ---- (1)
Calculations:
Let the total distance be 2D.
According to the question;
⇒ D/21 + D/24 = 10
⇒ (8D + 7D/168) = 10
⇒ 15D = 10 × 168
⇒ D = 112
Total distance = 2D = 2 × 112 = 224 km