Question : A car travels from A to B at 44 km/hr and returns from B to A at 66 km/hr. Find its average speed during the whole journey.
Option 1: 63.3 km/hr
Option 2: 52.8 km/hr
Option 3: 68.2 km/hr
Option 4: 55.4 km/hr
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Correct Answer: 52.8 km/hr
Solution : $S_1$ = 66 km/hr $S_2$ = 44 km/hr Average speed = $\frac{2S_1S_2}{S_1+S_2}$ = $\frac{2×66×44}{66 + 44}$ = $\frac{2×66×44}{110}$ = $\frac{264}{5}$ = 52.8 km/hr Hence, the correct answer is 52.8 km/hr.
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Question : While going to the office, Sneha travels at a speed of 10 km/hr and on her way back, she travels at a speed of 15 km/hr. What is her average speed for the whole journey?
Option 1: 14 km/hr
Option 2: 12 km/hr
Option 3: 11 km/hr
Option 4: 13 km/hr
Question : A man goes from A to B at a speed of 200 km/hr and comes back to A at a speed of 300 km/hr. Find his average speed for the entire journey.
Option 1: 264 km/hr
Option 2: 345 km/hr
Option 3: 340 km/hr
Option 4: 240 km/hr
Question : A car covers the first 140 km of a journey in 10 hours and the next 260 km in 15 hours. What is the average speed of the Car for the whole journey?
Option 1: 16 km/hr
Option 2: 14 km/hr
Option 3: 10 km/hr
Option 4: 15 km/hr
Question : During a journey, a person travels half of the distance at a speed of 18 km/h and the remaining half of the journey at a speed of 22 km/h. What is his average speed for the entire journey?
Option 1: 21.4 km/h
Option 2: 20.2 km/h
Option 3: 19.2 km/h
Option 4: 19.8 km/h
Question : A man goes to a place on the car at a speed of 144 km/hr and comes back at a lower speed. If the average speed is 60 km/hr in total, then find his returning speed.
Option 1: 40.05 km/hr
Option 2: 37.89 km/hr
Option 3: 33.33 km/hr
Option 4: 22.25 km/hr
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