Bank robber holds up a bank and speeds off at 71 mph. police start chasing him 10 minutes later going 78 mph. how long will it take to catch up to them?

It takes 1.68 hours to catch up to them.

Step-by-step explanation:

The speed of robber = 71 mph

The  speed of police =  78 mph

The police  start 10 minutes  later

by that time robber would have travelled

10 minutes  =0.166667 hours

then the distance  =  11.8 mph

Let them meet at distance x from the bank.

time taken by police to reach x , time =----------------------(1)

time taken by robber in the same time = ---------------(2)

Equating (1) and (2)

71x =78x - 920.4

920.4 = 78x - 71x

920.4 = 7x

x = 131.48

The distance where they catch up with the robber from the bank is 131.48 miles

speed of police = 78 mph

distance =  131.48  miles

time they catch up =

= 1.68 hours

215.92 dollars is the answer