A swimmer can swim at 4 km/h in still water. If he swims across a river that is
Practice Questions
Q1
A swimmer can swim at 4 km/h in still water. If he swims across a river that is 1 km wide and the current is 2 km/h, how long will it take him to reach the opposite bank?
15 minutes
30 minutes
45 minutes
1 hour
Questions & Step-by-Step Solutions
A swimmer can swim at 4 km/h in still water. If he swims across a river that is 1 km wide and the current is 2 km/h, how long will it take him to reach the opposite bank?
Step 1: Understand the problem. The swimmer is swimming across a river that is 1 km wide.
Step 2: Identify the swimmer's speed in still water, which is 4 km/h.
Step 3: Recognize that the current of the river is 2 km/h, but this does not affect the distance across the river.
Step 4: Calculate the time it takes to swim across the river using the formula: Time = Distance / Speed.
Step 5: Plug in the values: Distance = 1 km and Speed = 4 km/h.
Step 6: Calculate: Time = 1 km / 4 km/h = 0.25 hours.
