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
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Correct Answer: 12 km/hr
Solution : Sneha travels while going to the office at a speed = S1= 10 km/hr Sneha travels on her way back at a speed = S2 = 15 km/hr Average Speed = $\frac{2\text{S1S2}}{(\text{S1} + \text{S2})}$ = $\frac{(2 × 10 × 15)}{(10 + 15)}$ = $\frac{(2 × 10 × 15)}{(25)}$ = 12 km/hr Hence, the correct answer is 12 km/hr.
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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 : 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 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
Question : A bus travels first 100 km at a speed of 100 km/hr. It covers the next 150 km at a speed of 90 km/hr. What is the average speed?
Option 1: 120.50 km/hr
Option 2: 93.75 km/hr
Option 3: 100.25 km/hr
Option 4: 156.25 km/hr
Question : Meena completed a journey in 33 hours. She travels one-fourth distance of the journey at the speed of 60 km/hr and the remaining distance at 40 km/hr. What is the total journey in km?
Option 1: 1220 km
Option 2: 480 km
Option 3: 1440 km
Option 4: 680 km
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