A part of the journey is covered in 22.5 minutes at a speed of 68 km/h and the remaining part in 12 minutes at a speed of 72 km/h. The total distance of the journey is (to the nearest integer):
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 40 km.
A part of the journey is covered in 22.5 minutes at a speed of 68 km/h
Time:
⇒ 22.5 minutes = 22.5/60 = 0.375 hours
⇒ 12 minutes = 12/60 = 0.2 hours
Now,
Distance = Speed × Time
Distance for the first part = 68 × 0.375 = 25.5 km
Distance for the second part = 72 × 0.2 = 14.4 km
Total distance = 25.5 + 14.4 = 39.9 km or 40 km approximately