Question : A person travels in a car at 40 km/hr for 3 hours, on a bike at 30 km/hr for 2 hours, and in a train at 80 km/hr for 5 hours. What is the average speed at which he travelled?
Option 1: 56 km/hr
Option 2: 60 km/hr
Option 3: 62 km/hr
Option 4: 58 km/hr
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Correct Answer: 58 km/hr
Solution : We know Distance = Speed × Time Distance travelled by the person travelling at 40 km/hr for 3 hours = 40 × 3 km = 120 km Distance travelled by the person travelling at 30 km/hr for 2 hours = 30 × 2 km = 60 km Distance travelled by the person travelling at 80 km/hr for 5 hours = 80 × 5 km = 400 km Now, Average Speed = $\frac{\text{Total Distance}}{\text{Total Time}}$ = $\frac{120+60+400}{3+2+5}$ = 58 km/hr Hence, the correct answer is 58 km/hr.
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Question : A car travels 80 km in 2 hours, and a train travels 180 km in 3 hours. The ratio of the speed of the car to that of the train is:
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