A runner wants to run 11.5 km . She knows that her running pace is 7.9 miles per hour.How many minutes must she run?

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Answer 1 · 2018-04-15T04:34:37

Approximately 55 minutes

#1 "mile" = 1.6km#

SO #7.9 "miles" = 7.9times1.6km#

Minutes required: #(11.5times60)/( 7.9times1.6)# = #54.59 "mins"#

Answer 2 · 2018-04-15T04:42:44

#color(purple)("She must run for 54.27 min"#

#1 mile = 1.60934 Km#

#7.9 m = 1.60934 * 7.9 Km = 12.7138 Km#

#"In 1 hour distance covered " = 7.9 m = 12.7138 Km#

#:. "In 1 minute dist. covered " = 12.7138 / 60 = 0.2119 Km#

#"Time taken to cover " 0.2119 Km = 1 " min"#

#"Time taken to cover " 11.5 Km = (11.5 / 0.2119 )= 54.27 " min"#