51.

A man covers a total distance of 100 km on bicycle. For the first 2 hours, the speed was 20 km/hr and for the rest of the journey, it came down to 10 km/hr. The average speed will be

• 

• 13 km/hr

• 

• 20 km/hr

To cover a distance with a speed of 60 km/hr, a train takes 15 hours. If it covers the same distance in 12 hours, what will be its speed?

• 65 km/hr

• 70 km/hr

• 75 km/hr

• 80 km/hr

At an average of 80 km/hr Shatabdi Express reaches Ranchi from Kolkata in 7 hours. Then the distance between Kolkata and Ranchi is:

• 560 km

• 506 km

• 560 m

• 650 m

A bus travels at the speed of 36 km/hr, then the distance covered by it in one second is:

• 10 m

• 15 m

• 12.5 m

• 13.5 m

A car moving in the morning fog passes a man walking at 4km/h in the same direction. The man can see the car for 3 min and visibility is upto a distance of 130 m. The speed of the car is:

• 

• 

• 7 km/hr

• 5 km/hr

A man travells  of the distance of his journey by bus,  by Rickshaw and 2 km on foot. The total distance travelled by the man is

• 12 km

• 18 km

• 20 km

• 24 km

A man goes to a place on bicycle at speed of 16 km/hr, and comes back at lower speed. If the average speed is 6.4 km/hr in total, then the return speed (in  km/hr) is

• 10

• 8

• 6

• 4

By walking at  of his usual speed, a man reaches his office 20 min later than his usual time. The usual time taken by him to reach his office is

• 75 min

• 60 min

• 40 min

• 30 min

Buses start from a bus terminal with a speed of 20 km/hr at intervals of 10 min. What is the speed of a man coming from the opposite direction towards the bus terminal if he meets the buses at intervals of 8 min?

• 3 km/h

• 4 km/h

• 5 km/h

• 7 km/h

A student goes to school at the rate of  and reaches 6 min late. If he travels at the speed of 3 km/h, he is 10 min early. The difference (in km) between the school and his house is

• 5

• 4

• 3

• 1