A man travels 3 hours of the journey at a speed of 100 km/hr and remaining 2 hours of the journey at 120 km/hr. What is the average speed (in km/hr) of the entire journey?
If downstream speed of a boat is numerically equal to square of the upstream speed, what will be the maximum value of ratio of speed of boat to speed of stream such that speed of boat and stream are natural number and not equal.
1). 3 : 2
2). 3 : 1
3). 3 : 5
4). 4 : 7
Boat covered 110 km in downstream with 10% less of its usual speed in 5 hr, if still water speed of boat is 400% more than speed of current. Find time required by boat to cover 120 km in upstream with its usual speed?
1). 4.5 hours
2). 5.5 hours
3). 6.5 hours
4). 8.5 hours
With an average speed of 40 km/h, a motorcyclist reaches his destination in time. If after traveling 30 kms the motorcycle undergoes a problem and the average speed of motorcycle reduces to 30 km/h for the remaining journey. He is late by 20 minutes then it would have taken if the problem had not occurred. The length of the total journey is:
1). 40 km
2). 70 km
3). 30 km
4). 80 km
A car travels a certain distance at 30 km/h and comes back at 70 km/h. What is the average speed for the total journey?
1). 62 km/hr
2). 32 km/hr
3). 52 km/hr
4). 42 km/hr