Exercise :: Time and Distance  General Questions
 Time and Distance  Important Formulas
 Time and Distance  General Questions
 Time and Distance  Data Sufficiency 1
6.  In a flight of 600 km, an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by 200 km/hr and the time of flight increased by 30 minutes. The duration of the flight is: 

Answer: Option A Explanation: Let the duration of the flight be x hours.
x(2x + 1) = 3 2x^{2} + x  3 = 0 (2x + 3)(x  1) = 0 x = 1 hr. [neglecting the ve value of x] 
7.  A man complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr. Find the total journey in km. 

Answer: Option B Explanation:
15x = 168 x 20

8.  The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 km in 4 hours, then the speed of the first train is: 

Answer: Option D Explanation: Let the speed of two trains be 7x and 8x km/hr.
Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr. 
9.  A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is: 

Answer: Option C Explanation:

10.  A car travelling with of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car. 

Answer: Option D Explanation:
Let the actual speed be x km/hr.
