Question : Sunil drove for 2 hours at a rate of 50 miles per hour and 3 hours at 60 miles per hour. What was his average speed for the whole journey?
Option 1: 55 miles per hour
Option 2: 50 miles per hour
Option 3: 56 miles per hour
Option 4: 52 miles per hour
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Correct Answer: 56 miles per hour
Solution : Let's denote the total distance travelled as $D$ and the total time as $T$. T1 = 2 hours and T2 = 3 hours Speed1 = 50 miles per hour and Speed2 = 60 miles per hour ⇒ Distance covered D1 = 2 × 50 = 100 miles ⇒ Distance covered D2 = 3 × 60 = 180 miles ⇒ Total distance = D1 + D2 = 100 + 180 = 280 ⇒ Total time = 2 + 3 = 5 hours ⇒ Average speed = $\frac{\text{Total distance}}{\text{Total time}}$ = $\frac{280}{5}$ = 56 Hence, the correct answer is 56 miles per hour.
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Question : Sajid drove for 6 hours at a rate of 60 km/hr and for 4 hours at 50 km/hr. What was his average speed for the whole journey?
Option 1: 52 km/hr
Option 2: 56 km/hr
Option 3: 54 km/hr
Option 4: 58 km/hr
Question : Kabir climbs up a hill at a speed of 3 miles per hour and comes down at 5 miles per hour. If the total time taken for the total journey is 10 hours, then what was the distance between the hilltop and the foothills?
Option 1: 3.75 miles
Option 2: 18.75 miles
Option 3: 37.5 miles
Option 4: 20.5 miles
Question : A man drives his car at a speed of 50 km/hr for 2 hours and then decides to slow down to 40 km/hr till the end of the journey. If his average speed for the journey was 44 km/hr, then for how much time did he drive his car at a speed of 40 km/hr?
Option 1: 2 hours
Option 2: 1 hour
Option 3: 3 hours
Option 4: 4 hours
Question : Sohan makes four journeys of equal distance. In the first journey, his speed was 240 km/hr and in each subsequent journey his speed was half the speed of the previous journey. What is the average speed of Sohan in these four journeys?
Option 1: 50 km/hr
Option 2: 64 km/hr
Option 3: 60 km/hr
Option 4: 52 km/hr
Question : Krishna travels from point A to point B in 6 hours and returns to point A from point B in 5 hours. Point A and Point B are 220 miles apart along a straight highway. What is the average speed of Krishna for the whole journey?
Option 1: 44 miles/hr
Option 2: 40 miles/hr
Option 3: 50 miles/hr
Option 4: 22 miles/hr
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