In a 1000 km trip, a man drives at a speed of 50 km/h for the first five-eighth of the total distance. If he completes the whole journey in 19 hours (resting time not included). what is his speed (in Km/h, correct up to one decimal place) for the rest of the journey?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 57.7
Distance = 1000 km
First 5/8 = 625 km at 50 km/h ⇒ Time = 625 ÷ 50 = 12.5h
Total time = 19 h ⇒ Remaining time = 6.5 h
Remaining distance = 375 km
Speed = 375 ÷ 6.5 = 57.7 km/h