Ramu and Mohan can separately complete a work in 10 hours and 16 hours,respectively. After working for 2 hours together, Mohan leaves the work. In how many hours will Ramu finish the remaining work?
6\( \frac{1}{4} \)
6\( \frac{3}{4} \) hours
5\( \frac{3}{4} \) hours
7\( \frac{3}{4} \) hours
A car covers a certain distance in 3 h with a speed of 108 km/h. If the speed is reduced by 27 km/h, then the time taken by the car to cover the same distance will be:
Rohan divides his complete journey in three equal parts and covers the first part at 30 km/h, second part at 40 km/h and last part at 50 km/h with his car. What is the average speed (in km/h) of his car during the entire journey?
A thief started his journey at a speed of 60 km/h. After 30 minutes, police started from the same place but at a speed of 80 km/h. How much time (in hours) will the police take to catch the thief?
\( \frac{3}{2} \) hours
\( \frac{1}{2} \) hours
\( \frac{1}{3} \) hours
\( \frac{5}{2} \) hours
Evaluate the following expression: [(\( \frac{-4}{7} \)) ÷ (\( \frac{1}{12} \))] ÷ [(-\( \frac{4}{5} \) × {(-2) - (-\( \frac{2}{7} \))}]