A man cycles from P to Q, a distance of 30 km, in 2 hours 48 minutes. The road from P is a level road for 18 km and then it is uphill to Q. The man's average speed on the level road is 15 km/h. What is his average uphill speed (in km/h)?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 7.5.
Distance = Speed × Time
Total time taken = 2 hours 48 minutes = = 2.8 hours
Time taken to travel level road = = 1.2 hours
Remaining time = 2.8 - 1.2 = 1.6 hours
Distance to e travelled on uphill road = 30 - 18 = 12 km
Speed on uphill road = = 7.5 km/hr