Question : A car completed a journey of 400 km in $12\frac{1}{2}$ hours. The first $\frac{3}{4}$th of the journey was done at 30 km/hr. Calculate the speed for the rest of the journey.
Option 1: 45 km/hr
Option 2: 25 km/hr
Option 3: 40 km/hr
Option 4: 30 km/hr
Correct Answer: 40 km/hr
Solution : Total journey = 400 km Speed of the car for $\frac{3}{4}$th journey = 30 km/hr $\frac{3}{4}$th journey= $400\times(\frac{3}{4})$km = 300 km Remaining journey = 400 – 300 = 100 km Let the speed of the car for the rest of the journey be $x$ km/hr. According to the question, $\frac{300}{30}+\frac{100}{x}=\frac{25}{2}$ $⇒10+\frac{100}{x}=\frac{25}{2}$ $⇒x=100\times\frac{2}{5}$ $\therefore x= 40$ km/hr Hence, the correct answer is 40 km/hr.
Result | Eligibility | Application | Selection Process | Cutoff | Admit Card | Preparation Tips
Question : A car can cover a certain distance in $4\frac{1}{2}$ hours. If the speed increases by 5 km/hr, it would take $\frac{1}{2}$ hour less to cover the same distance. Find the slower speed of the car.
Question : A car, during its entire journey of 5 hours, travels the first 45 minutes at a certain speed, the next 75 minutes at a speed of 85 km/hr, and the last 3 hours at a speed of 70 km/hr. During its entire journey, the average speed of the car is found to be 73 km/hr. What is the
Question : During a journey of 120 km, Rahi drives the first 60 km at the speed of 60 km/hr, the next 30 km at 60 km/hr and the remaining 30 km at the speed of 30 km/hr. Determine the average speed.
Question : On a journey across Kolkata, a taxi averages 50 km/hr for 50% of the distance, 40 km/hr for 40% of it and 20 km/hr for the remaining. The average speed (in km/hr) for the whole journey is:
Question : A man covers a certain distance by bike. If he covers 25% of the distance at the speed of 25 km/hr, 50% of the distance at the speed of 50 km/hr and the remaining distance at the speed of 12.5 km/hr, find his average speed over the whole journey.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile