Ram covers 500 km in 20 hours in traffic; he covered some distance by bike at 30 km/h and the rest by car at 20 km/h. The distance covered by a bike (in km) is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 300
Given that
Ram covers 500 kilometres in 20 hours.
Let the distance covered by bike be x km at a speed of 30 km/h
The remaining (500 - x) km covered by car at a speed of 20 km/h
According to the question
⇒ (x/30) + [(500 - x)/20] = 20
⇒ (x/30) + 25 - (x/20) = 20
⇒ (x/20) - (x/30) = 5
⇒ (x/60) = 5
⇒ x = 300 km