book Maths Puzzle Numerical Ability

I need help with this problem:
In a walkaton to raise money for a charity, Elisa walked a certain distance a 5 mi/h and then jogged twice that distance at 8 mi/h. Her total time

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Bob and Moe set off at the same time on a 30 km walk for charity. Bob walks 1.4 km/hr faster than Moe, but stops to talk to a friend for 20 minutes. Even with this delay Bob finish Write the following phrase using symbols. Use the variable x to represent the number.

A number divided by 10