 
 <prompt> Jo-Bob enta inside di hot air balloon, release di anchor rope, an pull di lift chain, wey ignite di flame an provide di warm air wey cause di balloon to rise. Wen di lift chain dey pulled, di balloon go rise at a rate of 50 feet per minute. But wen di chain no dey pulled, di balloon go slowly descend at a rate of 10 feet per minute. During im balloon ride, e pull di chain for 15 minutes, come release di rope for 10 minutes, come pull di chain for another 15 minutes, an finally release di chain an allow di balloon to slowly descend back to di earth. During im balloon ride, wetin be di highest elevation wey di balloon reach? <response>: ```Di first 15-minute chain pull cause di balloon to rise 50*15=750 feet.
Releasing di chain for 10 minutes cause di balloon to descend 10*10=100 feet.
Di second 15-minute chain pull cause di balloon to rise anoda 50*15=750 feet.
So, at di end of di second chain pull, wen di balloon dey at im highest elevation, di balloon don rise reach an elevation of 750-100+750=1400 feet above di earth's surface.

Di answer go be 1400.``` 