Shyam drives his car 30 km at a speed of 45 km/h and, for the next 1 h 20 m he drives it at a speed of 51 km/h. Find his average speed (in km/h) for the entire journey.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 49
Formula used:
Average speed = Total distance/total time taken
Calculations:
Shyam travels 45 km in 60 mins
He can travel 30 km in 40 mins
Distance traveled by shyam in the next 1 hour 20 mins = 51 × 4/3 = 68 km
Average speed = (30 + 68)/2 = 98/2 = 49
Hence, the average speed for the entire journey is 49 km/h.