Question:A boat moves upstream at the rate of `1` km in `10` minutes and downstream at the rate of `1` km in `6` minutes. The speed of the current is : 

A `1 km∕hr` 
B `1.5 km∕hr` 
C `2 km∕hr` 
D `2.5 km∕hr` 

+ Answer
C 

+ Explanation
Rate upstream 

`= (1/10 xx 60) km∕hr`

`= 6 km∕hr`

Rate downstream 

`= (1/6 xx 60) km∕hr`

`= 10 km∕hr`

Rate of the current 

`= 1/2 (10 - 6) km∕hr`

`= 2 km∕hr`

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Irin Moni

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