KATHMANDU, Feb 8: The value of the US dollar has soared to an all-time high against the Nepali rupee, reaching Rs 140.43 on Friday, with some money exchangers offering the rate well above Rs 141. This marks the highest exchange rate ever set by Nepal Rastra Bank (NRB), surpassing the previous high of Rs 139.80 on Tuesday. By Thursday, the rate had jumped to Rs 140.25, reflecting a sharp increase over the past few days.