Rashi travelled a distance of 400 km at an average speed of 50 km/h. She covers the first half distance in the first lag in 2 hours, while she covers another lag at half the speed of that of the first lag in 1 hour. What is the speed (in km/h) of the remaining distance?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 30.
Total time = = 8 hours
First half (200 km) in 2 hrs
Speed = = 100 km/h
Second lag: speed = = 50 km/h, time = 1 hr
Distance = 50 × 1 = 50 km
Remaining distance = 400 – 200 – 50 = 150 km
Remaining time = 8 – 2 – 1 = 5 hrs
Speed = = 30 km/h