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A motor cyclist is riding North in still...

A motor cyclist is riding North in still air at `36 kmh^(-1)`.The wind starts blowing West ward with a velocity `18 kmh^(-1)`
If the wind velocity becomes `36 kmh^(-1)` due West, then how much more distance the motor cyclist would cover in `10 min`

A

`10 km`

B

`1.8 km`

C

`3.6 km`

D

`8.5 km`

Text Solution

Verified by Experts

The correct Answer is:
B
New apparent velocity,`R'=sqrt(10^(2)+10^(2))=10sqrt2ms^(-1)`
Distance covered, `s'=(10sqrt2)xx(10xx60)m`
`=6sqrt2km=8.5km`
Extra distance covered `=8.5-6.7=1.8 km`
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