There is road besides a river. Two friends started from a place A, moved to a temple
situated at another place B and then returned to A again. One of them moves on a cycle at
a speed of 12 km/hr, while the other sails on a boat at a speed of 10 km/hr. If the river
flows at the speed of 4 km/hr, which of the two friends will return to place A?
Both
Boater
Cyclist
None of these
Explanation:
The cyclist moves both ways at a speed of 12khr so average speed fo the cyclist – 12 km/hr
Also bat sailor moves downstream at 10+4 = 14km/hr and upstream 10- 4 = 6km/hr
Average speed of the boat sailor = 2 x 14 x 6 / 14 +6 = 42/ 5 = 8.4km/hr
The average speed of cyclist is greater cyclist comes first and return to place A
The cyclist moves both ways at a speed of 12khr so average speed fo the cyclist – 12 km/hr
Also bat sailor moves downstream at 10+4 = 14km/hr and upstream 10- 4 = 6km/hr
Average speed of the boat sailor = 2 x 14 x 6 / 14 +6 = 42/ 5 = 8.4km/hr
The average speed of cyclist is greater cyclist comes first and return to place A