19
Vinay covers 560 km at a speed of 70 km/hr and the next 240 km at a speed of 120 km/hr. What is his average speed?
- A40 km/hr
- B80 km/hr
- C35 km/hr
- D36 km/hr
Answer not set
Discussion 1
Log in or create a free account to reply and vote.
0
CCommunity
Time taken to cover 560 km = Distance/Speed = 560/70 = 8 hours
Time taken to cover 240 km = Distance/Speed = 240/120 = 2 hours
Hence,
Total distance travelled = 560 + 240 = 800 km
Total time taken = 8 + 2 = 10 hours
? Average speed = Total distance travelled/Total time taken
∴ Average speed of Vinay = 800/10 = 80 km/hr.
Time taken to cover 240 km = Distance/Speed = 240/120 = 2 hours
Hence,
Total distance travelled = 560 + 240 = 800 km
Total time taken = 8 + 2 = 10 hours
? Average speed = Total distance travelled/Total time taken
∴ Average speed of Vinay = 800/10 = 80 km/hr.