Separately, we have created many pages on the Arithmetics chapter

**Time Speed and Distance**for clear understanding and performance well in competitive exams.**Boats and Streams**is one of the important sub-topic of**Time speed and distance**. We have already discussed the core concept and**shortcuts formula**on this topic in**Boat and Streams shortcuts formula part-1**. Now we are going to solve some**aptitude question**of__Boats and Streams__by using math tricks to save time and score well in our**upcoming competitive exam**. So, look at below, some essential**aptitude question**which followed by the question level of the competitive math section. Especially all the questions are selected from the Boats and Speeds chapter.## Boat and Stream question

**Aptitude question1**: A swimmer takes 40 minutes to reach 4 km distance in downstream and 60 minutes to 5 km in upstream. Then, find the rate of the stream and the speed of the swimmer in the still water.

**Easy math solution**: The shortcut formula for the Rate of the stream is (D-U)/ 2, where U is upstream rate and the D is the rates of downstream. Look at the image for easy math solution.

Don't be hopeless to see the Boat and Stream Formula and Solution. You can jump several steps by practice some

**questions**. To get a clear concept, we provide all the steps in the solution. Please note that we used the formula to find stream rate as (D-U)/2. Where D is the downstream speed of the swimmer and U is the upstream rate.**Question and Solution**

►A ship travelled 80 km in 4 hours in

Solution: The shortcut formula for the rate of the stream is (D-U)/2. Here (D-U)/2 means half of the difference between downstream and upstream rate. To apply this formula we have to find out the **downstream**and came back in 8 hours in**upstream**. Now find the speed of the stream.**upstream and Downstream rate**. Look at below how we quickly solve this aptitude problem.

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