Oenquery not allow me to pass variable (Conversion failed when converting date and/or time from character )

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SQL-Server-2008R2

Hi all,
i am new in SQL can some one assist me to solve this problem???
i am passing two parameters to my SP using openquery ,but parameters not allowed.get error like Conversion failed when converting date and/or time from character string.
how to correct this?????

Below is my Query
parameters are

@Fromdate varchar(10),
@Todate varchar(10)

SELECT * into #TblPlatinumDate
FROM  OPENQUERY([MUMFRDBSACT], 'SELECT Distinct(Passenger_Pri_MobileNo) as     MobileNo ,COUNT(*)as TripCount
from  [E2e_Tabcab].[dbo].[FR_TRANS_Booking] a (nolock)
where  IsCancel = ''0'' and Convert(DATE,PickupDateTime,105) 
BETWEEN ''+@Fromdate+'' and ''+@Todate+'' 
GROUP BY Passenger_Pri_MobileNo,IsCancel
having count(IsCancel)>= ''46''')